37973021 has 2 divisors, whose sum is σ = 37973022. Its totient is φ = 37973020.

The previous prime is 37973017. The next prime is 37973029. The reversal of 37973021 is 12037973.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23872996 + 14100025 = 4886^2 + 3755^2 .

It is an emirp because it is prime and its reverse (12037973) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 37973021 - 2² = 37973017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (37973029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18986510 + 18986511.

It is an arithmetic number, because the mean of its divisors is an integer number (18986511).

Almost surely, 2^37973021 is an apocalyptic number.

It is an amenable number.

37973021 is a deficient number, since it is larger than the sum of its proper divisors (1).

37973021 is an equidigital number, since it uses as much as digits as its factorization.

37973021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7938, while the sum is 32.

The square root of 37973021 is about 6162.2253285643. The cubic root of 37973021 is about 336.1179580409.

The spelling of 37973021 in words is "thirty-seven million, nine hundred seventy-three thousand, twenty-one".