36684721 has 4 divisors (see below), whose sum is σ = 37063012. Its totient is φ = 36306432.

The previous prime is 36684689. The next prime is 36684727. The reversal of 36684721 is 12748663.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5760000 + 30924721 = 2400^2 + 5561^2 .

It is a cyclic number.

It is not a de Polignac number, because 36684721 - 2⁵ = 36684689 is a prime.

It is a super-3 number, since 3×36684721³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (36684727) 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, 189000 + ... + 189193.

It is an arithmetic number, because the mean of its divisors is an integer number (9265753).

Almost surely, 2^36684721 is an apocalyptic number.

It is an amenable number.

36684721 is a deficient number, since it is larger than the sum of its proper divisors (378291).

36684721 is an equidigital number, since it uses as much as digits as its factorization.

36684721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378290.

The product of its digits is 48384, while the sum is 37.

The square root of 36684721 is about 6056.7913122379. The cubic root of 36684721 is about 332.2730159798.

The spelling of 36684721 in words is "thirty-six million, six hundred eighty-four thousand, seven hundred twenty-one".