37964821 has 2 divisors, whose sum is σ = 37964822. Its totient is φ = 37964820.

The previous prime is 37964807. The next prime is 37964827. The reversal of 37964821 is 12846973.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23902321 + 14062500 = 4889^2 + 3750^2 .

It is a cyclic number.

It is not a de Polignac number, because 37964821 - 2¹¹ = 37962773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (37964827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18982410 + 18982411.

It is an arithmetic number, because the mean of its divisors is an integer number (18982411).

Almost surely, 2^37964821 is an apocalyptic number.

It is an amenable number.

37964821 is a deficient number, since it is larger than the sum of its proper divisors (1).

37964821 is an equidigital number, since it uses as much as digits as its factorization.

37964821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 40.

The square root of 37964821 is about 6161.5599485844. The cubic root of 37964821 is about 336.0937622162.

The spelling of 37964821 in words is "thirty-seven million, nine hundred sixty-four thousand, eight hundred twenty-one".