402657 has 4 divisors (see below), whose sum is σ = 536880. Its totient is φ = 268436.

The previous prime is 402631. The next prime is 402691. The reversal of 402657 is 756204.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 402657 - 2⁶ = 402593 is a prime.

It is a D-number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (402697) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67107 + ... + 67112.

It is an arithmetic number, because the mean of its divisors is an integer number (134220).

2⁴⁰²⁶⁵⁷ is an apocalyptic number.

It is an amenable number.

402657 is a deficient number, since it is larger than the sum of its proper divisors (134223).

402657 is a wasteful number, since it uses less digits than its factorization.

402657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134222.

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 402657 is about 634.5525982927. The cubic root of 402657 is about 73.8434112730.

The spelling of 402657 in words is "four hundred two thousand, six hundred fifty-seven".