402540831 has 36 divisors (see below), whose sum is σ = 737875944. Its totient is φ = 209109600.

The previous prime is 402540781. The next prime is 402540833. The reversal of 402540831 is 138045204.

402540831 is a `hidden beast` number, since 40 + 2 + 540 + 83 + 1 = 666.

It is not a de Polignac number, because 402540831 - 2⁶ = 402540767 is a prime.

It is a super-2 number, since 2×402540831² = 324078241244341122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 402540795 and 402540804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402540833) 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 in 35 ways as a sum of consecutive naturals, for example, 36640 + ... + 46341.

It is an arithmetic number, because the mean of its divisors is an integer number (20496554).

Almost surely, 2^402540831 is an apocalyptic number.

402540831 is a deficient number, since it is larger than the sum of its proper divisors (335335113).

402540831 is a wasteful number, since it uses less digits than its factorization.

402540831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83012 (or 83002 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 402540831 is about 20063.4202218864. The cubic root of 402540831 is about 738.3630916514.

The spelling of 402540831 in words is "four hundred two million, five hundred forty thousand, eight hundred thirty-one".