37939221 has 12 divisors (see below), whose sum is σ = 56691180. Its totient is φ = 24420480.

The previous prime is 37939211. The next prime is 37939241. The reversal of 37939221 is 12293973.

It can be written as a sum of positive squares in 2 ways, for example, as 30404196 + 7535025 = 5514^2 + 2745^2 .

It is not a de Polignac number, because 37939221 - 2¹⁷ = 37808149 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (37939211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72420 + ... + 72941.

It is an arithmetic number, because the mean of its divisors is an integer number (4724265).

Almost surely, 2^37939221 is an apocalyptic number.

It is an amenable number.

37939221 is a deficient number, since it is larger than the sum of its proper divisors (18751959).

37939221 is a wasteful number, since it uses less digits than its factorization.

37939221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145396 (or 145393 counting only the distinct ones).

The product of its digits is 20412, while the sum is 36.

The square root of 37939221 is about 6159.4822022634. The cubic root of 37939221 is about 336.0182016075.

The spelling of 37939221 in words is "thirty-seven million, nine hundred thirty-nine thousand, two hundred twenty-one".