36639723 has 4 divisors (see below), whose sum is σ = 48852968. Its totient is φ = 24426480.

The previous prime is 36639679. The next prime is 36639739. The reversal of 36639723 is 32793663.

36639723 is nontrivially palindromic in base 15.

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

It is a de Polignac number, because none of the positive numbers 2^k-36639723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (36639523) 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, 6106618 + ... + 6106623.

It is an arithmetic number, because the mean of its divisors is an integer number (12213242).

Almost surely, 2^36639723 is an apocalyptic number.

36639723 is a deficient number, since it is larger than the sum of its proper divisors (12213245).

36639723 is a wasteful number, since it uses less digits than its factorization.

36639723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12213244.

The product of its digits is 122472, while the sum is 39.

The square root of 36639723 is about 6053.0754992813. The cubic root of 36639723 is about 332.1371034598.

The spelling of 36639723 in words is "thirty-six million, six hundred thirty-nine thousand, seven hundred twenty-three".