37864821 has 4 divisors (see below), whose sum is σ = 50486432. Its totient is φ = 25243212.

The previous prime is 37864817. The next prime is 37864859. The reversal of 37864821 is 12846873.

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 not a de Polignac number, because 37864821 - 2² = 37864817 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 37864821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (37864861) 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, 6310801 + ... + 6310806.

It is an arithmetic number, because the mean of its divisors is an integer number (12621608).

Almost surely, 2^37864821 is an apocalyptic number.

It is an amenable number.

37864821 is a deficient number, since it is larger than the sum of its proper divisors (12621611).

37864821 is a wasteful number, since it uses less digits than its factorization.

37864821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12621610.

The product of its digits is 64512, while the sum is 39.

The square root of 37864821 is about 6153.4397697548. The cubic root of 37864821 is about 335.7984104685.

The spelling of 37864821 in words is "thirty-seven million, eight hundred sixty-four thousand, eight hundred twenty-one".