18949518 has 32 divisors (see below), whose sum is σ = 48126720. Its totient is φ = 5414040.

The previous prime is 18949487. The next prime is 18949523. The reversal of 18949518 is 81594981.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24688 + ... + 25443.

It is an arithmetic number, because the mean of its divisors is an integer number (1503960).

Almost surely, 2^18949518 is an apocalyptic number.

18949518 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18949518 is an abundant number, since it is smaller than the sum of its proper divisors (29177202).

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

18949518 is a wasteful number, since it uses less digits than its factorization.

18949518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50149 (or 50143 counting only the distinct ones).

The product of its digits is 103680, while the sum is 45.

The square root of 18949518 is about 4353.1044094990. The cubic root of 18949518 is about 266.6036285022.

The spelling of 18949518 in words is "eighteen million, nine hundred forty-nine thousand, five hundred eighteen".