18521055 has 80 divisors (see below), whose sum is σ = 39029760. Its totient is φ = 8227008.

The previous prime is 18521047. The next prime is 18521071. The reversal of 18521055 is 55012581.

It is not a de Polignac number, because 18521055 - 2³ = 18521047 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 133176 + ... + 133314.

It is an arithmetic number, because the mean of its divisors is an integer number (487872).

Almost surely, 2^18521055 is an apocalyptic number.

18521055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18521055 is an abundant number, since it is smaller than the sum of its proper divisors (20508705).

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

18521055 is a wasteful number, since it uses less digits than its factorization.

18521055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210 (or 201 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 27.

The square root of 18521055 is about 4303.6095315444. The cubic root of 18521055 is about 264.5789206834.

The spelling of 18521055 in words is "eighteen million, five hundred twenty-one thousand, fifty-five".