36865021 has 4 divisors (see below), whose sum is σ = 38467872. Its totient is φ = 35262172.

The previous prime is 36865019. The next prime is 36865043. The reversal of 36865021 is 12056863.

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 36865021 - 2¹ = 36865019 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36865001) 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, 801391 + ... + 801436.

It is an arithmetic number, because the mean of its divisors is an integer number (9616968).

Almost surely, 2^36865021 is an apocalyptic number.

It is an amenable number.

36865021 is a deficient number, since it is larger than the sum of its proper divisors (1602851).

36865021 is a wasteful number, since it uses less digits than its factorization.

36865021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1602850.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 36865021 is about 6071.6571872924. The cubic root of 36865021 is about 332.8164842375.

The spelling of 36865021 in words is "thirty-six million, eight hundred sixty-five thousand, twenty-one".