1240443256 has 32 divisors (see below), whose sum is σ = 2521360800. Its totient is φ = 568713600.

The previous prime is 1240443247. The next prime is 1240443257. The reversal of 1240443256 is 6523440421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240443257) 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, 23791 + ... + 55198.

It is an arithmetic number, because the mean of its divisors is an integer number (78792525).

Almost surely, 2^1240443256 is an apocalyptic number.

It is an amenable number.

1240443256 is an abundant number, since it is smaller than the sum of its proper divisors (1280917544).

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

1240443256 is a wasteful number, since it uses less digits than its factorization.

1240443256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79159 (or 79155 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 31.

The square root of 1240443256 is about 35219.9269732349. The cubic root of 1240443256 is about 1074.4650681991.

Adding to 1240443256 its reverse (6523440421), we get a palindrome (7763883677).

The spelling of 1240443256 in words is "one billion, two hundred forty million, four hundred forty-three thousand, two hundred fifty-six".