402321431 has 4 divisors (see below), whose sum is σ = 404406192. Its totient is φ = 400236672.

The previous prime is 402321427. The next prime is 402321433. The reversal of 402321431 is 134123204.

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 402321431 - 2² = 402321427 is a prime.

It is a super-2 number, since 2×402321431² = 323725067683775522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402321433) 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, 1042091 + ... + 1042476.

It is an arithmetic number, because the mean of its divisors is an integer number (101101548).

Almost surely, 2^402321431 is an apocalyptic number.

402321431 is a deficient number, since it is larger than the sum of its proper divisors (2084761).

402321431 is a wasteful number, since it uses less digits than its factorization.

402321431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2084760.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 402321431 is about 20057.9518146794. The cubic root of 402321431 is about 738.2289219886.

Adding to 402321431 its reverse (134123204), we get a palindrome (536444635).

The spelling of 402321431 in words is "four hundred two million, three hundred twenty-one thousand, four hundred thirty-one".