18090998 has 8 divisors (see below), whose sum is σ = 27183600. Its totient is φ = 9029800.

The previous prime is 18090997. The next prime is 18091027. The reversal of 18090998 is 89909081.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18090997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6353 + ... + 8748.

It is an arithmetic number, because the mean of its divisors is an integer number (3397950).

Almost surely, 2^18090998 is an apocalyptic number.

18090998 is a deficient number, since it is larger than the sum of its proper divisors (9092602).

18090998 is a wasteful number, since it uses less digits than its factorization.

18090998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15702.

The product of its (nonzero) digits is 46656, while the sum is 44.

The square root of 18090998 is about 4253.3513844967. The cubic root of 18090998 is about 262.5150310365.

The spelling of 18090998 in words is "eighteen million, ninety thousand, nine hundred ninety-eight".