1243442420 has 24 divisors (see below), whose sum is σ = 2848614048. Its totient is φ = 452160800.

The previous prime is 1243442419. The next prime is 1243442423. The reversal of 1243442420 is 242443421.

It is a happy number.

It is a super-2 number, since 2×1243442420² = 3092298103710912800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1243442420.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243442423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2825786 + ... + 2826225.

It is an arithmetic number, because the mean of its divisors is an integer number (118692252).

Almost surely, 2^1243442420 is an apocalyptic number.

1243442420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1243442420 is an abundant number, since it is smaller than the sum of its proper divisors (1605171628).

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

1243442420 is a wasteful number, since it uses less digits than its factorization.

1243442420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5652031 (or 5652029 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 26.

The square root of 1243442420 is about 35262.4789259065. The cubic root of 1243442420 is about 1075.3303243038.

Adding to 1243442420 its reverse (242443421), we get a palindrome (1485885841).

The spelling of 1243442420 in words is "one billion, two hundred forty-three million, four hundred forty-two thousand, four hundred twenty".