18519966 has 48 divisors (see below), whose sum is σ = 41434848. Its totient is φ = 5976000.

The previous prime is 18519961. The next prime is 18519967. The reversal of 18519966 is 66991581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18519961) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 110815 + ... + 110981.

It is an arithmetic number, because the mean of its divisors is an integer number (863226).

Almost surely, 2^18519966 is an apocalyptic number.

18519966 is an abundant number, since it is smaller than the sum of its proper divisors (22914882).

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

18519966 is a wasteful number, since it uses less digits than its factorization.

18519966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337 (or 334 counting only the distinct ones).

The product of its digits is 116640, while the sum is 45.

The square root of 18519966 is about 4303.4830079832. The cubic root of 18519966 is about 264.5737350160.

The spelling of 18519966 in words is "eighteen million, five hundred nineteen thousand, nine hundred sixty-six".