18549090 has 48 divisors (see below), whose sum is σ = 55119168. Its totient is φ = 4239648.

The previous prime is 18549071. The next prime is 18549101. The reversal of 18549090 is 9094581.

18549090 is a `hidden beast` number, since 1 + 85 + 490 + 90 = 666.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14092 + ... + 15351.

It is an arithmetic number, because the mean of its divisors is an integer number (1148316).

Almost surely, 2^18549090 is an apocalyptic number.

18549090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18549090 is an abundant number, since it is smaller than the sum of its proper divisors (36570078).

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

18549090 is a wasteful number, since it uses less digits than its factorization.

18549090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29463 (or 29460 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 18549090 is about 4306.8654494888. The cubic root of 18549090 is about 264.7123495588.

The spelling of 18549090 in words is "eighteen million, five hundred forty-nine thousand, ninety".