18249665 has 16 divisors (see below), whose sum is σ = 25149312. Its totient is φ = 12453504.

The previous prime is 18249659. The next prime is 18249667. The reversal of 18249665 is 56694281.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-18249665 is a prime.

It is a super-2 number, since 2×18249665² = 666100545224450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18249667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6797 + ... + 9093.

It is an arithmetic number, because the mean of its divisors is an integer number (1571832).

Almost surely, 2^18249665 is an apocalyptic number.

It is an amenable number.

18249665 is a deficient number, since it is larger than the sum of its proper divisors (6899647).

18249665 is a wasteful number, since it uses less digits than its factorization.

18249665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2536.

The product of its digits is 103680, while the sum is 41.

The square root of 18249665 is about 4271.9626636945. The cubic root of 18249665 is about 263.2802604503.

The spelling of 18249665 in words is "eighteen million, two hundred forty-nine thousand, six hundred sixty-five".