18989715 has 8 divisors (see below), whose sum is σ = 30383568. Its totient is φ = 10127840.

The previous prime is 18989713. The next prime is 18989767. The reversal of 18989715 is 51798981.

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

It is not a de Polignac number, because 18989715 - 2¹ = 18989713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18989713) 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, 632976 + ... + 633005.

It is an arithmetic number, because the mean of its divisors is an integer number (3797946).

Almost surely, 2^18989715 is an apocalyptic number.

18989715 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18989715 is a deficient number, since it is larger than the sum of its proper divisors (11393853).

18989715 is a wasteful number, since it uses less digits than its factorization.

18989715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1265989.

The product of its digits is 181440, while the sum is 48.

The square root of 18989715 is about 4357.7190134289. The cubic root of 18989715 is about 266.7920079169.

The spelling of 18989715 in words is "eighteen million, nine hundred eighty-nine thousand, seven hundred fifteen".