18004455 has 48 divisors (see below), whose sum is σ = 36289344. Its totient is φ = 8087040.

The previous prime is 18004417. The next prime is 18004463. The reversal of 18004455 is 55440081.

It is not a de Polignac number, because 18004455 - 2¹⁸ = 17742311 is a prime.

18004455 is a modest number, since divided by 4455 gives 1800 as remainder.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18747 + ... + 19683.

It is an arithmetic number, because the mean of its divisors is an integer number (756028).

Almost surely, 2^18004455 is an apocalyptic number.

18004455 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18004455 is an abundant number, since it is smaller than the sum of its proper divisors (18284889).

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

18004455 is a wasteful number, since it uses less digits than its factorization.

18004455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1016 (or 1013 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 18004455 is about 4243.1656814223. The cubic root of 18004455 is about 262.0957587539.

The spelling of 18004455 in words is "eighteen million, four thousand, four hundred fifty-five".