402332431 has 2 divisors, whose sum is σ = 402332432. Its totient is φ = 402332430.

The previous prime is 402332423. The next prime is 402332453. The reversal of 402332431 is 134233204.

It is a happy number.

It is an a-pointer prime, because the next prime (402332453) can be obtained adding 402332431 to its sum of digits (22).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 402332431 - 2³ = 402332423 is a prime.

It is a super-2 number, since 2×402332431² = 323742770068739522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402332401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201166215 + 201166216.

It is an arithmetic number, because the mean of its divisors is an integer number (201166216).

Almost surely, 2^402332431 is an apocalyptic number.

402332431 is a deficient number, since it is larger than the sum of its proper divisors (1).

402332431 is an equidigital number, since it uses as much as digits as its factorization.

402332431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 22.

The square root of 402332431 is about 20058.2260182699. The cubic root of 402332431 is about 738.2356499790.

Adding to 402332431 its reverse (134233204), we get a palindrome (536565635).

The spelling of 402332431 in words is "four hundred two million, three hundred thirty-two thousand, four hundred thirty-one".