1256512402 has 16 divisors (see below), whose sum is σ = 1971309312. Its totient is φ = 599536960.

The previous prime is 1256512399. The next prime is 1256512403. The reversal of 1256512402 is 2042156521.

It is not an unprimeable number, because it can be changed into a prime (1256512403) 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, 11863 + ... + 51514.

It is an arithmetic number, because the mean of its divisors is an integer number (123206832).

Almost surely, 2^1256512402 is an apocalyptic number.

1256512402 is a deficient number, since it is larger than the sum of its proper divisors (714796910).

1256512402 is a wasteful number, since it uses less digits than its factorization.

1256512402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63833.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 1256512402 is about 35447.3186856213. The cubic root of 1256512402 is about 1079.0848448896.

Adding to 1256512402 its reverse (2042156521), we get a palindrome (3298668923).

The spelling of 1256512402 in words is "one billion, two hundred fifty-six million, five hundred twelve thousand, four hundred two".