40731 has 4 divisors (see below), whose sum is σ = 54312. Its totient is φ = 27152.

The previous prime is 40709. The next prime is 40739. The reversal of 40731 is 13704.

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

It is a cyclic number.

It is not a de Polignac number, because 40731 - 2⁵ = 40699 is a prime.

It is a super-2 number, since 2×40731² = 3318028722, which contains 22 as substring.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 40731.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 40731.

It is not an unprimeable number, because it can be changed into a prime (40739) 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, 6786 + ... + 6791.

It is an arithmetic number, because the mean of its divisors is an integer number (13578).

2⁴⁰⁷³¹ is an apocalyptic number.

40731 is a deficient number, since it is larger than the sum of its proper divisors (13581).

40731 is a wasteful number, since it uses less digits than its factorization.

40731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13580.

The product of its (nonzero) digits is 84, while the sum is 15.

The square root of 40731 is about 201.8192260415. The cubic root of 40731 is about 34.4065946434.

The spelling of 40731 in words is "forty thousand, seven hundred thirty-one".