18272709 has 80 divisors (see below), whose sum is σ = 35018368. Its totient is φ = 9237888.

The previous prime is 18272701. The next prime is 18272731. The reversal of 18272709 is 90727281.

It is not a de Polignac number, because 18272709 - 2³ = 18272701 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18272701) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 272694 + ... + 272760.

Almost surely, 2^18272709 is an apocalyptic number.

It is an amenable number.

18272709 is a deficient number, since it is larger than the sum of its proper divisors (16745659).

18272709 is a wasteful number, since it uses less digits than its factorization.

18272709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136 (or 127 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 18272709 is about 4274.6589337630. The cubic root of 18272709 is about 263.3910292138.

It can be divided in two parts, 18272 and 709, that added together give a palindrome (18981).

The spelling of 18272709 in words is "eighteen million, two hundred seventy-two thousand, seven hundred nine".