18372665 has 8 divisors (see below), whose sum is σ = 23344200. Its totient is φ = 13833472.

The previous prime is 18372661. The next prime is 18372667. The reversal of 18372665 is 56627381.

It can be written as a sum of positive squares in 4 ways, for example, as 1175056 + 17197609 = 1084^2 + 4147^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18372665 - 2² = 18372661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18372661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107990 + ... + 108159.

It is an arithmetic number, because the mean of its divisors is an integer number (2918025).

Almost surely, 2^18372665 is an apocalyptic number.

It is an amenable number.

18372665 is a deficient number, since it is larger than the sum of its proper divisors (4971535).

18372665 is a wasteful number, since it uses less digits than its factorization.

18372665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216171.

The product of its digits is 60480, while the sum is 38.

The square root of 18372665 is about 4286.3346812866. The cubic root of 18372665 is about 263.8704263517.

The spelling of 18372665 in words is "eighteen million, three hundred seventy-two thousand, six hundred sixty-five".