36645921 has 24 divisors (see below), whose sum is σ = 57610280. Its totient is φ = 22311936.

The previous prime is 36645919. The next prime is 36645929. The reversal of 36645921 is 12954663.

It is a happy number.

36645921 is a `hidden beast` number, since 3 + 6 + 64 + 592 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 176400 + 36469521 = 420^2 + 6039^2 .

It is not a de Polignac number, because 36645921 - 2¹ = 36645919 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36645929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9735 + ... + 12963.

Almost surely, 2^36645921 is an apocalyptic number.

It is an amenable number.

36645921 is a deficient number, since it is larger than the sum of its proper divisors (20964359).

36645921 is a wasteful number, since it uses less digits than its factorization.

36645921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3345 (or 3342 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 36645921 is about 6053.5874487778. The cubic root of 36645921 is about 332.1558305819.

The spelling of 36645921 in words is "thirty-six million, six hundred forty-five thousand, nine hundred twenty-one".