18389212 has 6 divisors (see below), whose sum is σ = 32181128. Its totient is φ = 9194604.

The previous prime is 18389191. The next prime is 18389221. The reversal of 18389212 is 21298381.

It is an alternating number because its digits alternate between odd and even.

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 as a sum of consecutive naturals, namely, 2298648 + ... + 2298655.

Almost surely, 2^18389212 is an apocalyptic number.

It is an amenable number.

18389212 is a deficient number, since it is larger than the sum of its proper divisors (13791916).

18389212 is a wasteful number, since it uses less digits than its factorization.

18389212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4597307 (or 4597305 counting only the distinct ones).

The product of its digits is 6912, while the sum is 34.

The square root of 18389212 is about 4288.2644508006. The cubic root of 18389212 is about 263.9496192505.

The spelling of 18389212 in words is "eighteen million, three hundred eighty-nine thousand, two hundred twelve".