40312731 has 4 divisors (see below), whose sum is σ = 53750312. Its totient is φ = 26875152.

The previous prime is 40312693. The next prime is 40312739. The reversal of 40312731 is 13721304.

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

It is not a de Polignac number, because 40312731 - 2⁷ = 40312603 is a prime.

It is a super-2 number, since 2×40312731² = 3250232561356722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40312698 and 40312707.

It is not an unprimeable number, because it can be changed into a prime (40312739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6718786 + ... + 6718791.

It is an arithmetic number, because the mean of its divisors is an integer number (13437578).

Almost surely, 2^40312731 is an apocalyptic number.

40312731 is a deficient number, since it is larger than the sum of its proper divisors (13437581).

40312731 is a wasteful number, since it uses less digits than its factorization.

40312731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13437580.

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 40312731 is about 6349.2307408063. The cubic root of 40312731 is about 342.8841474513.

The spelling of 40312731 in words is "forty million, three hundred twelve thousand, seven hundred thirty-one".