37725421 has 4 divisors (see below), whose sum is σ = 37767744. Its totient is φ = 37683100.

The previous prime is 37725403. The next prime is 37725427. The reversal of 37725421 is 12452773.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 37725421 - 2⁷ = 37725293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (37725427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19795 + ... + 21616.

It is an arithmetic number, because the mean of its divisors is an integer number (9441936).

Almost surely, 2^37725421 is an apocalyptic number.

It is an amenable number.

37725421 is a deficient number, since it is larger than the sum of its proper divisors (42323).

37725421 is an equidigital number, since it uses as much as digits as its factorization.

37725421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42322.

The product of its digits is 11760, while the sum is 31.

The square root of 37725421 is about 6142.1023273794. The cubic root of 37725421 is about 335.3858211638.

The spelling of 37725421 in words is "thirty-seven million, seven hundred twenty-five thousand, four hundred twenty-one".