39625921 has 2 divisors, whose sum is σ = 39625922. Its totient is φ = 39625920.

The previous prime is 39625913. The next prime is 39625939. The reversal of 39625921 is 12952693.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38440000 + 1185921 = 6200^2 + 1089^2 .

It is a cyclic number.

It is not a de Polignac number, because 39625921 - 2³ = 39625913 is a prime.

It is not a weakly prime, because it can be changed into another prime (39625121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19812960 + 19812961.

It is an arithmetic number, because the mean of its divisors is an integer number (19812961).

Almost surely, 2^39625921 is an apocalyptic number.

It is an amenable number.

39625921 is a deficient number, since it is larger than the sum of its proper divisors (1).

39625921 is an equidigital number, since it uses as much as digits as its factorization.

39625921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29160, while the sum is 37.

The square root of 39625921 is about 6294.9123107475. The cubic root of 39625921 is about 340.9257383946.

The spelling of 39625921 in words is "thirty-nine million, six hundred twenty-five thousand, nine hundred twenty-one".