40308731 has 2 divisors, whose sum is σ = 40308732. Its totient is φ = 40308730.

The previous prime is 40308727. The next prime is 40308733. The reversal of 40308731 is 13780304.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40308731 - 2² = 40308727 is a prime.

It is a super-2 number, since 2×40308731² = 3249587589660722, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 40308733, it forms a pair of twin primes.

It is a Chen prime.

It is a nialpdrome in base 7.

It is a self number, because there is not a number n which added to its sum of digits gives 40308731.

It is not a weakly prime, because it can be changed into another prime (40308733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20154365 + 20154366.

It is an arithmetic number, because the mean of its divisors is an integer number (20154366).

Almost surely, 2^40308731 is an apocalyptic number.

40308731 is a deficient number, since it is larger than the sum of its proper divisors (1).

40308731 is an equidigital number, since it uses as much as digits as its factorization.

40308731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 40308731 is about 6348.9157342022. The cubic root of 40308731 is about 342.8728062702.

The spelling of 40308731 in words is "forty million, three hundred eight thousand, seven hundred thirty-one".