18368649 has 24 divisors (see below), whose sum is σ = 30080960. Its totient is φ = 10707552.

The previous prime is 18368641. The next prime is 18368657. The reversal of 18368649 is 94686381.

It is an interprime number because it is at equal distance from previous prime (18368641) and next prime (18368657).

It is not a de Polignac number, because 18368649 - 2³ = 18368641 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18368641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1909 + ... + 6354.

Almost surely, 2^18368649 is an apocalyptic number.

18368649 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

18368649 is a deficient number, since it is larger than the sum of its proper divisors (11712311).

18368649 is a wasteful number, since it uses less digits than its factorization.

18368649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8301 (or 8298 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 18368649 is about 4285.8661901651. The cubic root of 18368649 is about 263.8511988589.

The spelling of 18368649 in words is "eighteen million, three hundred sixty-eight thousand, six hundred forty-nine".