18112989 has 8 divisors (see below), whose sum is σ = 24170400. Its totient is φ = 12065456.

The previous prime is 18112957. The next prime is 18112993. The reversal of 18112989 is 98921181.

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

It is a cyclic number.

It is not a de Polignac number, because 18112989 - 2⁵ = 18112957 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18112949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5362 + ... + 8060.

It is an arithmetic number, because the mean of its divisors is an integer number (3021300).

Almost surely, 2^18112989 is an apocalyptic number.

It is an amenable number.

18112989 is a deficient number, since it is larger than the sum of its proper divisors (6057411).

18112989 is a wasteful number, since it uses less digits than its factorization.

18112989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4939.

The product of its digits is 10368, while the sum is 39.

The square root of 18112989 is about 4255.9357372968. The cubic root of 18112989 is about 262.6213570384.

The spelling of 18112989 in words is "eighteen million, one hundred twelve thousand, nine hundred eighty-nine".