402791631 has 16 divisors (see below), whose sum is σ = 586631808. Its totient is φ = 243802400.

The previous prime is 402791629. The next prime is 402791639. The reversal of 402791631 is 136197204.

It is a cyclic number.

It is not a de Polignac number, because 402791631 - 2¹ = 402791629 is a prime.

It is a super-2 number, since 2×402791631² = 324482196007280322, which contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 402791592 and 402791601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402791639) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19660 + ... + 34526.

It is an arithmetic number, because the mean of its divisors is an integer number (36664488).

Almost surely, 2^402791631 is an apocalyptic number.

402791631 is a deficient number, since it is larger than the sum of its proper divisors (183840177).

402791631 is a wasteful number, since it uses less digits than its factorization.

402791631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15702.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 402791631 is about 20069.6694292656. The cubic root of 402791631 is about 738.5164036501.

The spelling of 402791631 in words is "four hundred two million, seven hundred ninety-one thousand, six hundred thirty-one".