18989385 has 8 divisors (see below), whose sum is σ = 30383040. Its totient is φ = 10127664.

The previous prime is 18989381. The next prime is 18989387. The reversal of 18989385 is 58398981.

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

It is not a de Polignac number, because 18989385 - 2² = 18989381 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18989381) 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, 632965 + ... + 632994.

It is an arithmetic number, because the mean of its divisors is an integer number (3797880).

Almost surely, 2^18989385 is an apocalyptic number.

18989385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18989385 is a deficient number, since it is larger than the sum of its proper divisors (11393655).

18989385 is a wasteful number, since it uses less digits than its factorization.

18989385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1265967.

The product of its digits is 622080, while the sum is 51.

The square root of 18989385 is about 4357.6811494188. The cubic root of 18989385 is about 266.7904624861.

The spelling of 18989385 in words is "eighteen million, nine hundred eighty-nine thousand, three hundred eighty-five".