256670403 has 24 divisors (see below), whose sum is σ = 398304144. Its totient is φ = 146403840.

The previous prime is 256670389. The next prime is 256670419. The reversal of 256670403 is 304076652.

It is not a de Polignac number, because 256670403 - 2⁶ = 256670339 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (256670203) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14626 + ... + 26967.

It is an arithmetic number, because the mean of its divisors is an integer number (16596006).

Almost surely, 2^256670403 is an apocalyptic number.

256670403 is a deficient number, since it is larger than the sum of its proper divisors (141633741).

256670403 is a wasteful number, since it uses less digits than its factorization.

256670403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41635 (or 41624 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 33.

The square root of 256670403 is about 16020.9363958540. The cubic root of 256670403 is about 635.5142076706.

The spelling of 256670403 in words is "two hundred fifty-six million, six hundred seventy thousand, four hundred three".