1243452420 has 216 divisors, whose sum is σ = 4646265624. Its totient is φ = 267466752.

The previous prime is 1243452407. The next prime is 1243452433. The reversal of 1243452420 is 242543421.

It is an interprime number because it is at equal distance from previous prime (1243452407) and next prime (1243452433).

It can be written as a sum of positive squares in 4 ways, for example, as 122943744 + 1120508676 = 11088^2 + 33474^2 .

It is a super-4 number, since 4×1243452420⁴ (a number of 37 digits) contains 4444 as substring. Note that it is a super-d number also for d = 3.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 145794 + ... + 154086.

It is an arithmetic number, because the mean of its divisors is an integer number (21510489).

Almost surely, 2^1243452420 is an apocalyptic number.

1243452420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1243452420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2323132812).

1243452420 is an abundant number, since it is smaller than the sum of its proper divisors (3402813204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1243452420 is a wasteful number, since it uses less digits than its factorization.

1243452420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8339 (or 8327 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

The square root of 1243452420 is about 35262.6207193963. The cubic root of 1243452420 is about 1075.3332069663. Note that the first 3 decimals are identical.

Adding to 1243452420 its reverse (242543421), we get a palindrome (1485995841).

The spelling of 1243452420 in words is "one billion, two hundred forty-three million, four hundred fifty-two thousand, four hundred twenty".