402520431 has 4 divisors (see below), whose sum is σ = 536693912. Its totient is φ = 268346952.

The previous prime is 402520429. The next prime is 402520457. The reversal of 402520431 is 134025204.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 402520431 - 2¹ = 402520429 is a prime.

It is a super-2 number, since 2×402520431² = 324045394744851522, 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 = 402520398 and 402520407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402520421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67086736 + ... + 67086741.

It is an arithmetic number, because the mean of its divisors is an integer number (134173478).

Almost surely, 2^402520431 is an apocalyptic number.

402520431 is a deficient number, since it is larger than the sum of its proper divisors (134173481).

402520431 is a wasteful number, since it uses less digits than its factorization.

402520431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134173480.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 402520431 is about 20062.9118275489. The cubic root of 402520431 is about 738.3506184973.

Adding to 402520431 its reverse (134025204), we get a palindrome (536545635).

The spelling of 402520431 in words is "four hundred two million, five hundred twenty thousand, four hundred thirty-one".