18985512 has 64 divisors (see below), whose sum is σ = 58423680. Its totient is φ = 5006592.

The previous prime is 18985451. The next prime is 18985513. The reversal of 18985512 is 21558981.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (18985513) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2163 + ... + 6530.

It is an arithmetic number, because the mean of its divisors is an integer number (912870).

Almost surely, 2^18985512 is an apocalyptic number.

18985512 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18985512 is an abundant number, since it is smaller than the sum of its proper divisors (39438168).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18985512 is a wasteful number, since it uses less digits than its factorization.

18985512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8722 (or 8718 counting only the distinct ones).

The product of its digits is 28800, while the sum is 39.

The square root of 18985512 is about 4357.2367390354. The cubic root of 18985512 is about 266.7723234097.

The spelling of 18985512 in words is "eighteen million, nine hundred eighty-five thousand, five hundred twelve".