36393921 has 16 divisors (see below), whose sum is σ = 54062400. Its totient is φ = 24197184.

The previous prime is 36393919. The next prime is 36393943. The reversal of 36393921 is 12939363.

It is a happy number.

It is not a de Polignac number, because 36393921 - 2¹ = 36393919 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (36393221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9705 + ... + 12921.

It is an arithmetic number, because the mean of its divisors is an integer number (3378900).

Almost surely, 2^36393921 is an apocalyptic number.

It is an amenable number.

36393921 is a deficient number, since it is larger than the sum of its proper divisors (17668479).

36393921 is a wasteful number, since it uses less digits than its factorization.

36393921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3645 (or 3639 counting only the distinct ones).

The product of its digits is 26244, while the sum is 36.

The square root of 36393921 is about 6032.7374383442. The cubic root of 36393921 is about 331.3927090800.

The spelling of 36393921 in words is "thirty-six million, three hundred ninety-three thousand, nine hundred twenty-one".