402497251 has 4 divisors (see below), whose sum is σ = 433458592. Its totient is φ = 371535912.

The previous prime is 402497239. The next prime is 402497257. The reversal of 402497251 is 152794204.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 402497251 - 2⁹ = 402496739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402497257) 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, 15480651 + ... + 15480676.

It is an arithmetic number, because the mean of its divisors is an integer number (108364648).

Almost surely, 2^402497251 is an apocalyptic number.

402497251 is a deficient number, since it is larger than the sum of its proper divisors (30961341).

402497251 is a wasteful number, since it uses less digits than its factorization.

402497251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30961340.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 402497251 is about 20062.3341363860. The cubic root of 402497251 is about 738.3364450587.

The spelling of 402497251 in words is "four hundred two million, four hundred ninety-seven thousand, two hundred fifty-one".