18099554 has 16 divisors (see below), whose sum is σ = 30105216. Its totient is φ = 8091600.

The previous prime is 18099541. The next prime is 18099563. The reversal of 18099554 is 45599081.

It is a happy number.

It is a Curzon number.

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, 5402 + ... + 8085.

It is an arithmetic number, because the mean of its divisors is an integer number (1881576).

Almost surely, 2^18099554 is an apocalyptic number.

18099554 is a deficient number, since it is larger than the sum of its proper divisors (12005662).

18099554 is a wasteful number, since it uses less digits than its factorization.

18099554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13561.

The product of its (nonzero) digits is 64800, while the sum is 41.

The square root of 18099554 is about 4254.3570607085. The cubic root of 18099554 is about 262.5564093435.

The spelling of 18099554 in words is "eighteen million, ninety-nine thousand, five hundred fifty-four".