39393971 has 2 divisors, whose sum is σ = 39393972. Its totient is φ = 39393970.

The previous prime is 39393899. The next prime is 39394007. The reversal of 39393971 is 17939393.

It is a happy number.

39393971 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (17939393) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39393971 is a prime.

It is a super-2 number, since 2×39393971² = 3103769902297682, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (39395971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19696985 + 19696986.

It is an arithmetic number, because the mean of its divisors is an integer number (19696986).

Almost surely, 2^39393971 is an apocalyptic number.

39393971 is a deficient number, since it is larger than the sum of its proper divisors (1).

39393971 is an equidigital number, since it uses as much as digits as its factorization.

39393971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 137781, while the sum is 44.

The square root of 39393971 is about 6276.4616624337. The cubic root of 39393971 is about 340.2592342449.

The spelling of 39393971 in words is "thirty-nine million, three hundred ninety-three thousand, nine hundred seventy-one".