18418499 has 6 divisors (see below), whose sum is σ = 20245260. Its totient is φ = 16743980.

The previous prime is 18418487. The next prime is 18418537. The reversal of 18418499 is 99481481.

It is not a de Polignac number, because 18418499 - 2⁸ = 18418243 is a prime.

It is a super-2 number, since 2×18418499² = 678482210826002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18418409) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 75989 + ... + 76230.

It is an arithmetic number, because the mean of its divisors is an integer number (3374210).

Almost surely, 2^18418499 is an apocalyptic number.

18418499 is a deficient number, since it is larger than the sum of its proper divisors (1826761).

18418499 is a wasteful number, since it uses less digits than its factorization.

18418499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152241 (or 152230 counting only the distinct ones).

The product of its digits is 82944, while the sum is 44.

The square root of 18418499 is about 4291.6778770080. The cubic root of 18418499 is about 264.0896686143.

The spelling of 18418499 in words is "eighteen million, four hundred eighteen thousand, four hundred ninety-nine".