402644631 has 4 divisors (see below), whose sum is σ = 536859512. Its totient is φ = 268429752.

The previous prime is 402644611. The next prime is 402644639. The reversal of 402644631 is 136446204.

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

It is a de Polignac number, because none of the positive numbers 2^k-402644631 is a prime.

It is a super-2 number, since 2×402644631² = 324245397746252322, 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 (402644639) 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, 67107436 + ... + 67107441.

It is an arithmetic number, because the mean of its divisors is an integer number (134214878).

Almost surely, 2^402644631 is an apocalyptic number.

402644631 is a deficient number, since it is larger than the sum of its proper divisors (134214881).

402644631 is a wasteful number, since it uses less digits than its factorization.

402644631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134214880.

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 402644631 is about 20066.0068523860. The cubic root of 402644631 is about 738.4265514682.

The spelling of 402644631 in words is "four hundred two million, six hundred forty-four thousand, six hundred thirty-one".