18691012 has 12 divisors (see below), whose sum is σ = 32746896. Its totient is φ = 9334760.

The previous prime is 18690961. The next prime is 18691021. The reversal of 18691012 is 21019681.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2223 + ... + 6505.

It is an arithmetic number, because the mean of its divisors is an integer number (2728908).

Almost surely, 2^18691012 is an apocalyptic number.

It is an amenable number.

18691012 is a deficient number, since it is larger than the sum of its proper divisors (14055884).

18691012 is a wasteful number, since it uses less digits than its factorization.

18691012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5378 (or 5376 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 18691012 is about 4323.3103057726. The cubic root of 18691012 is about 265.3857536108.

The spelling of 18691012 in words is "eighteen million, six hundred ninety-one thousand, twelve".