18993116 has 6 divisors (see below), whose sum is σ = 33237960. Its totient is φ = 9496556.

The previous prime is 18993113. The next prime is 18993119. The reversal of 18993116 is 61139981.

It is an interprime number because it is at equal distance from previous prime (18993113) and next prime (18993119).

It is a self number, because there is not a number n which added to its sum of digits gives 18993116.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18993113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2374136 + ... + 2374143.

It is an arithmetic number, because the mean of its divisors is an integer number (5539660).

Almost surely, 2^18993116 is an apocalyptic number.

It is an amenable number.

18993116 is a deficient number, since it is larger than the sum of its proper divisors (14244844).

18993116 is a wasteful number, since it uses less digits than its factorization.

18993116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4748283 (or 4748281 counting only the distinct ones).

The product of its digits is 11664, while the sum is 38.

The square root of 18993116 is about 4358.1092230462. The cubic root of 18993116 is about 266.8079341777.

The spelling of 18993116 in words is "eighteen million, nine hundred ninety-three thousand, one hundred sixteen".