1256662140 has 48 divisors (see below), whose sum is σ = 3520372128. Its totient is φ = 334946304.

The previous prime is 1256662123. The next prime is 1256662189. The reversal of 1256662140 is 412666521.

1256662140 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166284 + ... + 173676.

It is an arithmetic number, because the mean of its divisors is an integer number (73341086).

Almost surely, 2^1256662140 is an apocalyptic number.

1256662140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1256662140 is an abundant number, since it is smaller than the sum of its proper divisors (2263709988).

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

1256662140 is a wasteful number, since it uses less digits than its factorization.

1256662140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10238 (or 10236 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 1256662140 is about 35449.4307429612. The cubic root of 1256662140 is about 1079.1277078671.

The spelling of 1256662140 in words is "one billion, two hundred fifty-six million, six hundred sixty-two thousand, one hundred forty".