39405937 has 2 divisors, whose sum is σ = 39405938. Its totient is φ = 39405936.

The previous prime is 39405913. The next prime is 39405997. The reversal of 39405937 is 73950493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36108081 + 3297856 = 6009^2 + 1816^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39405937 is a prime.

It is a super-4 number, since 4×39405937⁴ (a number of 31 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 39405937.

It is not a weakly prime, because it can be changed into another prime (39405997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19702968 + 19702969.

It is an arithmetic number, because the mean of its divisors is an integer number (19702969).

Almost surely, 2^39405937 is an apocalyptic number.

It is an amenable number.

39405937 is a deficient number, since it is larger than the sum of its proper divisors (1).

39405937 is an equidigital number, since it uses as much as digits as its factorization.

39405937 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 102060, while the sum is 40.

The square root of 39405937 is about 6277.4148341495. The cubic root of 39405937 is about 340.2936822388.

The spelling of 39405937 in words is "thirty-nine million, four hundred five thousand, nine hundred thirty-seven".