18715489 has 8 divisors (see below), whose sum is σ = 20253632. Its totient is φ = 17191440.

The previous prime is 18715481. The next prime is 18715493. The reversal of 18715489 is 98451781.

It is a happy number.

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 18715489 - 2³ = 18715481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18715481) 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, 669 + ... + 6154.

It is an arithmetic number, because the mean of its divisors is an integer number (2531704).

Almost surely, 2^18715489 is an apocalyptic number.

It is an amenable number.

18715489 is a deficient number, since it is larger than the sum of its proper divisors (1538143).

18715489 is a wasteful number, since it uses less digits than its factorization.

18715489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7047.

The product of its digits is 80640, while the sum is 43.

The square root of 18715489 is about 4326.1401965262. The cubic root of 18715489 is about 265.5015492596.

The spelling of 18715489 in words is "eighteen million, seven hundred fifteen thousand, four hundred eighty-nine".