1243450420 has 12 divisors (see below), whose sum is σ = 2611245924. Its totient is φ = 497380160.

The previous prime is 1243450367. The next prime is 1243450423. The reversal of 1243450420 is 240543421.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 679957776 + 563492644 = 26076^2 + 23738^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243450423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31086241 + ... + 31086280.

It is an arithmetic number, because the mean of its divisors is an integer number (217603827).

Almost surely, 2^1243450420 is an apocalyptic number.

1243450420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1243450420 is an abundant number, since it is smaller than the sum of its proper divisors (1367795504).

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

1243450420 is a wasteful number, since it uses less digits than its factorization.

1243450420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62172530 (or 62172528 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 1243450420 is about 35262.5923607440. The cubic root of 1243450420 is about 1075.3326304350.

Adding to 1243450420 its reverse (240543421), we get a palindrome (1483993841).

The spelling of 1243450420 in words is "one billion, two hundred forty-three million, four hundred fifty thousand, four hundred twenty".