40605731 has 2 divisors, whose sum is σ = 40605732. Its totient is φ = 40605730.

The previous prime is 40605727. The next prime is 40605749. The reversal of 40605731 is 13750604.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40605731 - 2² = 40605727 is a prime.

It is a super-2 number, since 2×40605731² = 3297650780088722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40605731.

It is not a weakly prime, because it can be changed into another prime (40605701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20302865 + 20302866.

It is an arithmetic number, because the mean of its divisors is an integer number (20302866).

Almost surely, 2^40605731 is an apocalyptic number.

40605731 is a deficient number, since it is larger than the sum of its proper divisors (1).

40605731 is an equidigital number, since it uses as much as digits as its factorization.

40605731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 40605731 is about 6372.2626279839. The cubic root of 40605731 is about 343.7128569895.

The spelling of 40605731 in words is "forty million, six hundred five thousand, seven hundred thirty-one".