1256347652 has 36 divisors (see below), whose sum is σ = 2600937360. Its totient is φ = 529303824.

The previous prime is 1256347649. The next prime is 1256347661. The reversal of 1256347652 is 2567436521.

It is an alternating number because its digits alternate between odd and even.

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 11 ways as a sum of consecutive naturals, for example, 42758 + ... + 65885.

It is an arithmetic number, because the mean of its divisors is an integer number (72248260).

Almost surely, 2^1256347652 is an apocalyptic number.

It is an amenable number.

1256347652 is an abundant number, since it is smaller than the sum of its proper divisors (1344589708).

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

1256347652 is a wasteful number, since it uses less digits than its factorization.

1256347652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108720 (or 108711 counting only the distinct ones).

The product of its digits is 302400, while the sum is 41.

The square root of 1256347652 is about 35444.9947383266. The cubic root of 1256347652 is about 1079.0376807448.

The spelling of 1256347652 in words is "one billion, two hundred fifty-six million, three hundred forty-seven thousand, six hundred fifty-two".