18917212 has 12 divisors (see below), whose sum is σ = 34000120. Its totient is φ = 9202896.

The previous prime is 18917207. The next prime is 18917221. The reversal of 18917212 is 21271981.

It is a congruent number.

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, 63762 + ... + 64057.

Almost surely, 2^18917212 is an apocalyptic number.

It is an amenable number.

18917212 is a deficient number, since it is larger than the sum of its proper divisors (15082908).

18917212 is a wasteful number, since it uses less digits than its factorization.

18917212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127860 (or 127858 counting only the distinct ones).

The product of its digits is 2016, while the sum is 31.

The square root of 18917212 is about 4349.3921414377. The cubic root of 18917212 is about 266.4520363259.

The spelling of 18917212 in words is "eighteen million, nine hundred seventeen thousand, two hundred twelve".