18897715 has 8 divisors (see below), whose sum is σ = 22997088. Its totient is φ = 14904960.

The previous prime is 18897709. The next prime is 18897737. The reversal of 18897715 is 51779881.

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

It is a de Polignac number, because none of the positive numbers 2^k-18897715 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26262 + ... + 26971.

It is an arithmetic number, because the mean of its divisors is an integer number (2874636).

Almost surely, 2^18897715 is an apocalyptic number.

18897715 is a deficient number, since it is larger than the sum of its proper divisors (4099373).

18897715 is an equidigital number, since it uses as much as digits as its factorization.

18897715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53309.

The product of its digits is 141120, while the sum is 46.

The square root of 18897715 is about 4347.1502159461. The cubic root of 18897715 is about 266.3604653777.

It can be divided in two parts, 1889 and 7715, that added together give a square (9604 = 98²).

The spelling of 18897715 in words is "eighteen million, eight hundred ninety-seven thousand, seven hundred fifteen".