18141998 has 32 divisors (see below), whose sum is σ = 32989440. Its totient is φ = 7309440.

The previous prime is 18141997. The next prime is 18142021. The reversal of 18141998 is 89914181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18141997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63965 + ... + 64247.

It is an arithmetic number, because the mean of its divisors is an integer number (1030920).

Almost surely, 2^18141998 is an apocalyptic number.

18141998 is a deficient number, since it is larger than the sum of its proper divisors (14847442).

18141998 is a wasteful number, since it uses less digits than its factorization.

18141998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552.

The product of its digits is 20736, while the sum is 41.

The square root of 18141998 is about 4259.3424375131. The cubic root of 18141998 is about 262.7614833582.

The spelling of 18141998 in words is "eighteen million, one hundred forty-one thousand, nine hundred ninety-eight".