402632431 has 4 divisors (see below), whose sum is σ = 402996600. Its totient is φ = 402268264.

The previous prime is 402632407. The next prime is 402632441. The reversal of 402632431 is 134236204.

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 402632431 - 2¹⁹ = 402108143 is a prime.

It is a super-2 number, since 2×402632431² = 324225748985939522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 402632396 and 402632405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402632441) 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, 180421 + ... + 182638.

It is an arithmetic number, because the mean of its divisors is an integer number (100749150).

Almost surely, 2^402632431 is an apocalyptic number.

402632431 is a deficient number, since it is larger than the sum of its proper divisors (364169).

402632431 is a wasteful number, since it uses less digits than its factorization.

402632431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364168.

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 402632431 is about 20065.7028533765. The cubic root of 402632431 is about 738.4190933656.

Adding to 402632431 its reverse (134236204), we get a palindrome (536868635).

The spelling of 402632431 in words is "four hundred two million, six hundred thirty-two thousand, four hundred thirty-one".