37948921 has 2 divisors, whose sum is σ = 37948922. Its totient is φ = 37948920.

The previous prime is 37948847. The next prime is 37948927. The reversal of 37948921 is 12984973.

37948921 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., 36421225 + 1527696 = 6035^2 + 1236^2 .

It is an emirp because it is prime and its reverse (12984973) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 37948921 - 2⁷ = 37948793 is a prime.

It is not a weakly prime, because it can be changed into another prime (37948927) 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, 18974460 + 18974461.

It is an arithmetic number, because the mean of its divisors is an integer number (18974461).

Almost surely, 2^37948921 is an apocalyptic number.

It is an amenable number.

37948921 is a deficient number, since it is larger than the sum of its proper divisors (1).

37948921 is an equidigital number, since it uses as much as digits as its factorization.

37948921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 43.

The square root of 37948921 is about 6160.2695557906. The cubic root of 37948921 is about 336.0468359928.

The spelling of 37948921 in words is "thirty-seven million, nine hundred forty-eight thousand, nine hundred twenty-one".