37725021 has 14 divisors (see below), whose sum is σ = 56562750. Its totient is φ = 25149528.

The previous prime is 37725019. The next prime is 37725071. The reversal of 37725021 is 12052773.

It can be written as a sum of positive squares in only one way, i.e., 34644996 + 3080025 = 5886^2 + 1755^2 .

It is not a de Polignac number, because 37725021 - 2¹ = 37725019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (37725001) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 25146 + ... + 26603.

Almost surely, 2^37725021 is an apocalyptic number.

It is an amenable number.

37725021 is a deficient number, since it is larger than the sum of its proper divisors (18837729).

37725021 is an frugal number, since it uses more digits than its factorization.

37725021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51767 (or 51752 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 27.

The square root of 37725021 is about 6142.0697651525. The cubic root of 37725021 is about 335.3846358021.

Adding to 37725021 its reverse (12052773), we get a palindrome (49777794).

The spelling of 37725021 in words is "thirty-seven million, seven hundred twenty-five thousand, twenty-one".