37640421 has 24 divisors (see below), whose sum is σ = 66917760. Its totient is φ = 19853856.

The previous prime is 37640401. The next prime is 37640429. The reversal of 37640421 is 12404673.

It is not a de Polignac number, because 37640421 - 2⁶ = 37640357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (37640429) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22161 + ... + 23798.

It is an arithmetic number, because the mean of its divisors is an integer number (2788240).

Almost surely, 2^37640421 is an apocalyptic number.

It is an amenable number.

37640421 is a deficient number, since it is larger than the sum of its proper divisors (29277339).

37640421 is a wasteful number, since it uses less digits than its factorization.

37640421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45985 (or 45982 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 37640421 is about 6135.1789704947. The cubic root of 37640421 is about 335.1337432863.

The spelling of 37640421 in words is "thirty-seven million, six hundred forty thousand, four hundred twenty-one".