37138021 has 4 divisors (see below), whose sum is σ = 37154572. Its totient is φ = 37121472.

The previous prime is 37138007. The next prime is 37138051. The reversal of 37138021 is 12083173.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6832996 + 30305025 = 2614^2 + 5505^2 .

It is a cyclic number.

It is not a de Polignac number, because 37138021 - 2¹⁵ = 37105253 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 (37138051) 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, 4260 + ... + 9613.

It is an arithmetic number, because the mean of its divisors is an integer number (9288643).

Almost surely, 2^37138021 is an apocalyptic number.

It is an amenable number.

37138021 is a deficient number, since it is larger than the sum of its proper divisors (16551).

37138021 is a wasteful number, since it uses less digits than its factorization.

37138021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16550.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 37138021 is about 6094.0972260048. The cubic root of 37138021 is about 333.6360102990.

The spelling of 37138021 in words is "thirty-seven million, one hundred thirty-eight thousand, twenty-one".