38957021 has 2 divisors, whose sum is σ = 38957022. Its totient is φ = 38957020.

The previous prime is 38956921. The next prime is 38957029. The reversal of 38957021 is 12075983.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38875225 + 81796 = 6235^2 + 286^2 .

It is an emirp because it is prime and its reverse (12075983) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38957021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38957029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19478510 + 19478511.

It is an arithmetic number, because the mean of its divisors is an integer number (19478511).

Almost surely, 2^38957021 is an apocalyptic number.

It is an amenable number.

38957021 is a deficient number, since it is larger than the sum of its proper divisors (1).

38957021 is an equidigital number, since it uses as much as digits as its factorization.

38957021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 38957021 is about 6241.5559758765. Note that the first 3 decimals coincide. The cubic root of 38957021 is about 338.9965251135.

The spelling of 38957021 in words is "thirty-eight million, nine hundred fifty-seven thousand, twenty-one".