18864518 has 4 divisors (see below), whose sum is σ = 28296780. Its totient is φ = 9432258.

The previous prime is 18864493. The next prime is 18864533. The reversal of 18864518 is 81546881.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4716128 + ... + 4716131.

It is an arithmetic number, because the mean of its divisors is an integer number (7074195).

Almost surely, 2^18864518 is an apocalyptic number.

18864518 is a deficient number, since it is larger than the sum of its proper divisors (9432262).

18864518 is an equidigital number, since it uses as much as digits as its factorization.

18864518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9432261.

The product of its digits is 61440, while the sum is 41.

The square root of 18864518 is about 4343.3302890754. The cubic root of 18864518 is about 266.2044050440.

The spelling of 18864518 in words is "eighteen million, eight hundred sixty-four thousand, five hundred eighteen".