18691116 has 12 divisors (see below), whose sum is σ = 43612632. Its totient is φ = 6230368.

The previous prime is 18691103. The next prime is 18691133. The reversal of 18691116 is 61119681.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 778785 + ... + 778808.

It is an arithmetic number, because the mean of its divisors is an integer number (3634386).

Almost surely, 2^18691116 is an apocalyptic number.

It is an amenable number.

18691116 is an abundant number, since it is smaller than the sum of its proper divisors (24921516).

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

18691116 is a wasteful number, since it uses less digits than its factorization.

18691116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1557600 (or 1557598 counting only the distinct ones).

The product of its digits is 2592, while the sum is 33.

The square root of 18691116 is about 4323.3223335763. The cubic root of 18691116 is about 265.3862458272.

The spelling of 18691116 in words is "eighteen million, six hundred ninety-one thousand, one hundred sixteen".