18479998 has 4 divisors (see below), whose sum is σ = 27720000. Its totient is φ = 9239998.

The previous prime is 18479959. The next prime is 18480001. The reversal of 18479998 is 89997481.

It is a semiprime because it is the product of two primes.

It is a super-3 number, since 3×18479998³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4619998 + ... + 4620001.

It is an arithmetic number, because the mean of its divisors is an integer number (6930000).

Almost surely, 2^18479998 is an apocalyptic number.

18479998 is a deficient number, since it is larger than the sum of its proper divisors (9240002).

18479998 is an equidigital number, since it uses as much as digits as its factorization.

18479998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9240001.

The product of its digits is 1306368, while the sum is 55.

The square root of 18479998 is about 4298.8368194199. The cubic root of 18479998 is about 264.3832721192.

The spelling of 18479998 in words is "eighteen million, four hundred seventy-nine thousand, nine hundred ninety-eight".