18218494 has 12 divisors (see below), whose sum is σ = 31789584. Its totient is φ = 7807884.

The previous prime is 18218491. The next prime is 18218513. The reversal of 18218494 is 49481281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18218491) 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, 92854 + ... + 93049.

It is an arithmetic number, because the mean of its divisors is an integer number (2649132).

Almost surely, 2^18218494 is an apocalyptic number.

18218494 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

18218494 is a deficient number, since it is larger than the sum of its proper divisors (13571090).

18218494 is a wasteful number, since it uses less digits than its factorization.

18218494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185919 (or 185912 counting only the distinct ones).

The product of its digits is 18432, while the sum is 37.

The square root of 18218494 is about 4268.3127814161. The cubic root of 18218494 is about 263.1302780465.

The spelling of 18218494 in words is "eighteen million, two hundred eighteen thousand, four hundred ninety-four".