1256734646 has 16 divisors (see below), whose sum is σ = 1918948320. Its totient is φ = 617179200.

The previous prime is 1256734601. The next prime is 1256734657. The reversal of 1256734646 is 6464376521.

It is a junction number, because it is equal to n+sod(n) for n = 1256734597 and 1256734606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3500 + ... + 50256.

It is an arithmetic number, because the mean of its divisors is an integer number (119934270).

Almost surely, 2^1256734646 is an apocalyptic number.

1256734646 is a deficient number, since it is larger than the sum of its proper divisors (662213674).

1256734646 is a wasteful number, since it uses less digits than its factorization.

1256734646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46999.

The product of its digits is 725760, while the sum is 44.

The square root of 1256734646 is about 35450.4533962543. The cubic root of 1256734646 is about 1079.1484617161.

The spelling of 1256734646 in words is "one billion, two hundred fifty-six million, seven hundred thirty-four thousand, six hundred forty-six".