18491268 has 24 divisors (see below), whose sum is σ = 44313472. Its totient is φ = 5997024.

The previous prime is 18491251. The next prime is 18491273. The reversal of 18491268 is 86219481.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20380 + ... + 21267.

Almost surely, 2^18491268 is an apocalyptic number.

It is an amenable number.

18491268 is an abundant number, since it is smaller than the sum of its proper divisors (25822204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18491268 is a wasteful number, since it uses less digits than its factorization.

18491268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41691 (or 41689 counting only the distinct ones).

The product of its digits is 27648, while the sum is 39.

The square root of 18491268 is about 4300.1474393327. The cubic root of 18491268 is about 264.4370057827.

The spelling of 18491268 in words is "eighteen million, four hundred ninety-one thousand, two hundred sixty-eight".