656403 has 8 divisors (see below), whose sum is σ = 954816. Its totient is φ = 397800.

The previous prime is 656389. The next prime is 656407. The reversal of 656403 is 304656.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 656403 - 2⁵ = 656371 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 656403.

It is not an unprimeable number, because it can be changed into a prime (656407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9913 + ... + 9978.

It is an arithmetic number, because the mean of its divisors is an integer number (119352).

2⁶⁵⁶⁴⁰³ is an apocalyptic number.

656403 is a deficient number, since it is larger than the sum of its proper divisors (298413).

656403 is a wasteful number, since it uses less digits than its factorization.

656403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19905.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 656403 is about 810.1870154477. The cubic root of 656403 is about 86.9074190206.

The spelling of 656403 in words is "six hundred fifty-six thousand, four hundred three".