402491907 has 6 divisors (see below), whose sum is σ = 581377212. Its totient is φ = 268327932.

The previous prime is 402491863. The next prime is 402491933. The reversal of 402491907 is 709194204.

It is not a de Polignac number, because 402491907 - 2¹⁰ = 402490883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (402491977) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22360653 + ... + 22360670.

It is an arithmetic number, because the mean of its divisors is an integer number (96896202).

Almost surely, 2^402491907 is an apocalyptic number.

402491907 is a deficient number, since it is larger than the sum of its proper divisors (178885305).

402491907 is a wasteful number, since it uses less digits than its factorization.

402491907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44721329 (or 44721326 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 402491907 is about 20062.2009510422. The cubic root of 402491907 is about 738.3331773863. Note that the first 3 decimals are identical.

The spelling of 402491907 in words is "four hundred two million, four hundred ninety-one thousand, nine hundred seven".