18998386 has 16 divisors (see below), whose sum is σ = 31554720. Its totient is φ = 8506080.

The previous prime is 18998383. The next prime is 18998411. The reversal of 18998386 is 68389981.

It is not an unprimeable number, because it can be changed into a prime (18998383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4971 + ... + 7918.

It is an arithmetic number, because the mean of its divisors is an integer number (1972170).

Almost surely, 2^18998386 is an apocalyptic number.

18998386 is a deficient number, since it is larger than the sum of its proper divisors (12556334).

18998386 is a wasteful number, since it uses less digits than its factorization.

18998386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12969.

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

The square root of 18998386 is about 4358.7138011115. The cubic root of 18998386 is about 266.8326088683.

The spelling of 18998386 in words is "eighteen million, nine hundred ninety-eight thousand, three hundred eighty-six".