18386998 has 8 divisors (see below), whose sum is σ = 31520592. Its totient is φ = 7880136.

The previous prime is 18386993. The next prime is 18387001. The reversal of 18386998 is 89968381.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18386993) 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, 656665 + ... + 656692.

It is an arithmetic number, because the mean of its divisors is an integer number (3940074).

Almost surely, 2^18386998 is an apocalyptic number.

18386998 is a deficient number, since it is larger than the sum of its proper divisors (13133594).

18386998 is a wasteful number, since it uses less digits than its factorization.

18386998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1313366.

The product of its digits is 746496, while the sum is 52.

The square root of 18386998 is about 4288.0062966372. The cubic root of 18386998 is about 263.9390259398.

It can be divided in two parts, 1838 and 6998, that added together give a square (8836 = 94²).

The spelling of 18386998 in words is "eighteen million, three hundred eighty-six thousand, nine hundred ninety-eight".