39392921 has 2 divisors, whose sum is σ = 39392922. Its totient is φ = 39392920.

The previous prime is 39392897. The next prime is 39392953. The reversal of 39392921 is 12929393.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31753225 + 7639696 = 5635^2 + 2764^2 .

It is a cyclic number.

It is not a de Polignac number, because 39392921 - 2¹⁰ = 39391897 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (39392981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19696460 + 19696461.

It is an arithmetic number, because the mean of its divisors is an integer number (19696461).

Almost surely, 2^39392921 is an apocalyptic number.

It is an amenable number.

39392921 is a deficient number, since it is larger than the sum of its proper divisors (1).

39392921 is an equidigital number, since it uses as much as digits as its factorization.

39392921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26244, while the sum is 38.

The square root of 39392921 is about 6276.3780160217. The cubic root of 39392921 is about 340.2562111481.

The spelling of 39392921 in words is "thirty-nine million, three hundred ninety-two thousand, nine hundred twenty-one".