402155631 has 8 divisors (see below), whose sum is σ = 595786160. Its totient is φ = 268103736.

The previous prime is 402155629. The next prime is 402155647. The reversal of 402155631 is 136551204.

402155631 is a `hidden beast` number, since 4 + 0 + 21 + 5 + 5 + 631 = 666.

It is not a de Polignac number, because 402155631 - 2¹ = 402155629 is a prime.

It is a super-2 number, since 2×402155631² = 323458303090016322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 14894653 = 402155631 / (4 + 0 + 2 + 1 + 5 + 5 + 6 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 402155595 and 402155604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402155681) 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, 7447300 + ... + 7447353.

It is an arithmetic number, because the mean of its divisors is an integer number (74473270).

Almost surely, 2^402155631 is an apocalyptic number.

402155631 is a deficient number, since it is larger than the sum of its proper divisors (193630529).

402155631 is a wasteful number, since it uses less digits than its factorization.

402155631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14894662 (or 14894656 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 402155631 is about 20053.8183645908. The cubic root of 402155631 is about 738.1274979667.

The spelling of 402155631 in words is "four hundred two million, one hundred fifty-five thousand, six hundred thirty-one".