406539531 has 12 divisors (see below), whose sum is σ = 589140552. Its totient is φ = 270141696.

The previous prime is 406539527. The next prime is 406539533. The reversal of 406539531 is 135935604.

It is not a de Polignac number, because 406539531 - 2² = 406539527 is a prime.

It is a super-2 number, since 2×406539531² = 330548780531399922, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (406539533) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70806 + ... + 76331.

It is an arithmetic number, because the mean of its divisors is an integer number (49095046).

Almost surely, 2^406539531 is an apocalyptic number.

406539531 is a deficient number, since it is larger than the sum of its proper divisors (182601021).

406539531 is a wasteful number, since it uses less digits than its factorization.

406539531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147450 (or 147447 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 36.

The square root of 406539531 is about 20162.8254716446. The cubic root of 406539531 is about 740.7999208481.

The spelling of 406539531 in words is "four hundred six million, five hundred thirty-nine thousand, five hundred thirty-one".