39697871 has 2 divisors, whose sum is σ = 39697872. Its totient is φ = 39697870.

The previous prime is 39697849. The next prime is 39697883. The reversal of 39697871 is 17879693.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 39697871 - 2⁶ = 39697807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39697891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19848935 + 19848936.

It is an arithmetic number, because the mean of its divisors is an integer number (19848936).

Almost surely, 2^39697871 is an apocalyptic number.

39697871 is a deficient number, since it is larger than the sum of its proper divisors (1).

39697871 is an equidigital number, since it uses as much as digits as its factorization.

39697871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 571536, while the sum is 50.

The square root of 39697871 is about 6300.6246515723. The cubic root of 39697871 is about 341.1319567388.

The spelling of 39697871 in words is "thirty-nine million, six hundred ninety-seven thousand, eight hundred seventy-one".