402540531 has 8 divisors (see below), whose sum is σ = 536818320. Its totient is φ = 268311552.

The previous prime is 402540511. The next prime is 402540553. The reversal of 402540531 is 135045204.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 402540531 - 2⁵ = 402540499 is a prime.

It is a super-2 number, since 2×402540531² = 324077758195523922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (402540511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17091 + ... + 33123.

It is an arithmetic number, because the mean of its divisors is an integer number (67102290).

Almost surely, 2^402540531 is an apocalyptic number.

402540531 is a deficient number, since it is larger than the sum of its proper divisors (134277789).

402540531 is a wasteful number, since it uses less digits than its factorization.

402540531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24405.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 402540531 is about 20063.4127455924. The cubic root of 402540531 is about 738.3629082258.

Adding to 402540531 its reverse (135045204), we get a palindrome (537585735).

The spelling of 402540531 in words is "four hundred two million, five hundred forty thousand, five hundred thirty-one".