18855090 has 48 divisors (see below), whose sum is σ = 49241088. Its totient is φ = 5005728.

The previous prime is 18855079. The next prime is 18855103. The reversal of 18855090 is 9055881.

18855090 is a `hidden beast` number, since 18 + 8 + 550 + 90 = 666.

It is a Curzon number.

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, 34197 + ... + 34743.

It is an arithmetic number, because the mean of its divisors is an integer number (1025856).

Almost surely, 2^18855090 is an apocalyptic number.

18855090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18855090 is an abundant number, since it is smaller than the sum of its proper divisors (30385998).

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

18855090 is a wasteful number, since it uses less digits than its factorization.

18855090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 943 (or 940 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 36.

The square root of 18855090 is about 4342.2448111547. The cubic root of 18855090 is about 266.1600502867.

It can be divided in two parts, 188 and 55090, that added together give a triangular number (55278 = T₃₃₂).

The spelling of 18855090 in words is "eighteen million, eight hundred fifty-five thousand, ninety".