37000021 has 4 divisors (see below), whose sum is σ = 37627200. Its totient is φ = 36372844.

The previous prime is 36999997. The next prime is 37000039. The reversal of 37000021 is 12000073.

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 a de Polignac number, because none of the positive numbers 2^k-37000021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 36999965 and 37000010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (37000121) 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, 313501 + ... + 313618.

It is an arithmetic number, because the mean of its divisors is an integer number (9406800).

Almost surely, 2^37000021 is an apocalyptic number.

It is an amenable number.

37000021 is a deficient number, since it is larger than the sum of its proper divisors (627179).

37000021 is an equidigital number, since it uses as much as digits as its factorization.

37000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 627178.

The product of its (nonzero) digits is 42, while the sum is 13.

The square root of 37000021 is about 6082.7642564873. The cubic root of 37000021 is about 333.2222482066. Note that the first 4 decimals are identical.

Adding to 37000021 its reverse (12000073), we get a palindrome (49000094).

The spelling of 37000021 in words is "thirty-seven million, twenty-one", and thus it is an aban number and an uban number.