1256680384 has 14 divisors (see below), whose sum is σ = 2493725264. Its totient is φ = 628340160.

The previous prime is 1256680363. The next prime is 1256680391. The reversal of 1256680384 is 4830866521.

It is a self number, because there is not a number n which added to its sum of digits gives 1256680384.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9817752 + ... + 9817879.

Almost surely, 2^1256680384 is an apocalyptic number.

It is an amenable number.

1256680384 is a deficient number, since it is larger than the sum of its proper divisors (1237044880).

1256680384 is an equidigital number, since it uses as much as digits as its factorization.

1256680384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19635643 (or 19635633 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 43.

The square root of 1256680384 is about 35449.6880663286. The cubic root of 1256680384 is about 1079.1329300373.

The spelling of 1256680384 in words is "one billion, two hundred fifty-six million, six hundred eighty thousand, three hundred eighty-four".