18993086 has 48 divisors (see below), whose sum is σ = 35335440. Its totient is φ = 7620480.

The previous prime is 18993053. The next prime is 18993089. The reversal of 18993086 is 68039981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18993089) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 116441 + ... + 116603.

It is an arithmetic number, because the mean of its divisors is an integer number (736155).

Almost surely, 2^18993086 is an apocalyptic number.

18993086 is a deficient number, since it is larger than the sum of its proper divisors (16342354).

18993086 is a wasteful number, since it uses less digits than its factorization.

18993086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249 (or 242 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 18993086 is about 4358.1057811852. The cubic root of 18993086 is about 266.8077937015.

The spelling of 18993086 in words is "eighteen million, nine hundred ninety-three thousand, eighty-six".