36503721 has 12 divisors (see below), whose sum is σ = 54546180. Its totient is φ = 23496480.

The previous prime is 36503707. The next prime is 36503749. The reversal of 36503721 is 12730563.

It is a happy number.

36503721 is a `hidden beast` number, since 3 + 650 + 3 + 7 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 10890000 + 25613721 = 3300^2 + 5061^2 .

It is not a de Polignac number, because 36503721 - 2⁶ = 36503657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (36503791) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69670 + ... + 70191.

It is an arithmetic number, because the mean of its divisors is an integer number (4545515).

Almost surely, 2^36503721 is an apocalyptic number.

It is an amenable number.

36503721 is a deficient number, since it is larger than the sum of its proper divisors (18042459).

36503721 is a wasteful number, since it uses less digits than its factorization.

36503721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139896 (or 139893 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 27.

The square root of 36503721 is about 6041.8309311003. The cubic root of 36503721 is about 331.7256436903.

The spelling of 36503721 in words is "thirty-six million, five hundred three thousand, seven hundred twenty-one".