18691916 has 12 divisors (see below), whose sum is σ = 34133232. Its totient is φ = 8939568.

The previous prime is 18691909. The next prime is 18691927. The reversal of 18691916 is 61919681.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101495 + ... + 101678.

It is an arithmetic number, because the mean of its divisors is an integer number (2844436).

Almost surely, 2^18691916 is an apocalyptic number.

It is an amenable number.

18691916 is a deficient number, since it is larger than the sum of its proper divisors (15441316).

18691916 is a wasteful number, since it uses less digits than its factorization.

18691916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203200 (or 203198 counting only the distinct ones).

The product of its digits is 23328, while the sum is 41.

The square root of 18691916 is about 4323.4148540245. The cubic root of 18691916 is about 265.3900320460.

The spelling of 18691916 in words is "eighteen million, six hundred ninety-one thousand, nine hundred sixteen".