37940681 has 2 divisors, whose sum is σ = 37940682. Its totient is φ = 37940680.

The previous prime is 37940659. The next prime is 37940687. The reversal of 37940681 is 18604973.

37940681 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 can be written as a sum of positive squares in only one way, i.e., 37699600 + 241081 = 6140^2 + 491^2 .

It is an emirp because it is prime and its reverse (18604973) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-37940681 is a prime.

It is a super-2 number, since 2×37940681² = 2878990549487522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (37940687) 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, 18970340 + 18970341.

It is an arithmetic number, because the mean of its divisors is an integer number (18970341).

Almost surely, 2^37940681 is an apocalyptic number.

It is an amenable number.

37940681 is a deficient number, since it is larger than the sum of its proper divisors (1).

37940681 is an equidigital number, since it uses as much as digits as its factorization.

37940681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 37940681 is about 6159.6007175790. The cubic root of 37940681 is about 336.0225118373.

The spelling of 37940681 in words is "thirty-seven million, nine hundred forty thousand, six hundred eighty-one".