39680731 has 2 divisors, whose sum is σ = 39680732. Its totient is φ = 39680730.

The previous prime is 39680717. The next prime is 39680777. The reversal of 39680731 is 13708693.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 39680731 - 2⁵ = 39680699 is a prime.

It is a super-2 number, since 2×39680731² = 3149120825388722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (39680791) 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, 19840365 + 19840366.

It is an arithmetic number, because the mean of its divisors is an integer number (19840366).

Almost surely, 2^39680731 is an apocalyptic number.

39680731 is a deficient number, since it is larger than the sum of its proper divisors (1).

39680731 is an equidigital number, since it uses as much as digits as its factorization.

39680731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 39680731 is about 6299.2643221252. The cubic root of 39680731 is about 341.0828538247.

The spelling of 39680731 in words is "thirty-nine million, six hundred eighty thousand, seven hundred thirty-one".