40512731 has 16 divisors (see below), whose sum is σ = 49781760. Its totient is φ = 32192640.

The previous prime is 40512727. The next prime is 40512733. The reversal of 40512731 is 13721504.

It is a cyclic number.

It is not a de Polignac number, because 40512731 - 2² = 40512727 is a prime.

It is a super-2 number, since 2×40512731² = 3282562746156722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 40512697 and 40512706.

It is not an unprimeable number, because it can be changed into a prime (40512733) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3011 + ... + 9491.

It is an arithmetic number, because the mean of its divisors is an integer number (3111360).

Almost surely, 2^40512731 is an apocalyptic number.

40512731 is a deficient number, since it is larger than the sum of its proper divisors (9269029).

40512731 is a wasteful number, since it uses less digits than its factorization.

40512731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6554.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 40512731 is about 6364.9611939116. The cubic root of 40512731 is about 343.4502525938.

The spelling of 40512731 in words is "forty million, five hundred twelve thousand, seven hundred thirty-one".