37936981 has 2 divisors, whose sum is σ = 37936982. Its totient is φ = 37936980.

The previous prime is 37936973. The next prime is 37937023. The reversal of 37936981 is 18963973.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35892081 + 2044900 = 5991^2 + 1430^2 .

It is a cyclic number.

It is not a de Polignac number, because 37936981 - 2³ = 37936973 is a prime.

It is a super-2 number, since 2×37936981² = 2878429054788722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (37936681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18968490 + 18968491.

It is an arithmetic number, because the mean of its divisors is an integer number (18968491).

Almost surely, 2^37936981 is an apocalyptic number.

It is an amenable number.

37936981 is a deficient number, since it is larger than the sum of its proper divisors (1).

37936981 is an equidigital number, since it uses as much as digits as its factorization.

37936981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 46.

The square root of 37936981 is about 6159.3003661130. The cubic root of 37936981 is about 336.0115884372.

The spelling of 37936981 in words is "thirty-seven million, nine hundred thirty-six thousand, nine hundred eighty-one".