18718645 has 8 divisors (see below), whose sum is σ = 24504480. Its totient is φ = 13613520.

The previous prime is 18718613. The next prime is 18718663. The reversal of 18718645 is 54681781.

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

It is not a de Polignac number, because 18718645 - 2⁵ = 18718613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18718598 and 18718607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170115 + ... + 170224.

It is an arithmetic number, because the mean of its divisors is an integer number (3063060).

Almost surely, 2^18718645 is an apocalyptic number.

It is an amenable number.

18718645 is a deficient number, since it is larger than the sum of its proper divisors (5785835).

18718645 is a wasteful number, since it uses less digits than its factorization.

18718645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340355.

The product of its digits is 53760, while the sum is 40.

The square root of 18718645 is about 4326.5049404802. The cubic root of 18718645 is about 265.5164722964.

The spelling of 18718645 in words is "eighteen million, seven hundred eighteen thousand, six hundred forty-five".