37867981 has 2 divisors, whose sum is σ = 37867982. Its totient is φ = 37867980.

The previous prime is 37867967. The next prime is 37868009. The reversal of 37867981 is 18976873.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19669225 + 18198756 = 4435^2 + 4266^2 .

It is an emirp because it is prime and its reverse (18976873) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-37867981 is a prime.

It is a super-2 number, since 2×37867981² = 2867967970032722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (37867961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18933990 + 18933991.

It is an arithmetic number, because the mean of its divisors is an integer number (18933991).

Almost surely, 2^37867981 is an apocalyptic number.

It is an amenable number.

37867981 is a deficient number, since it is larger than the sum of its proper divisors (1).

37867981 is an equidigital number, since it uses as much as digits as its factorization.

37867981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 508032, while the sum is 49.

The square root of 37867981 is about 6153.6965313541. The cubic root of 37867981 is about 335.8077515352.

The spelling of 37867981 in words is "thirty-seven million, eight hundred sixty-seven thousand, nine hundred eighty-one".