18198712 has 16 divisors (see below), whose sum is σ = 38997360. Its totient is φ = 7799424.

The previous prime is 18198701. The next prime is 18198737. The reversal of 18198712 is 21789181.

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, 162433 + ... + 162544.

It is an arithmetic number, because the mean of its divisors is an integer number (2437335).

Almost surely, 2^18198712 is an apocalyptic number.

It is an amenable number.

18198712 is an abundant number, since it is smaller than the sum of its proper divisors (20798648).

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

18198712 is a wasteful number, since it uses less digits than its factorization.

18198712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324990 (or 324986 counting only the distinct ones).

The product of its digits is 8064, while the sum is 37.

The square root of 18198712 is about 4265.9948429411. The cubic root of 18198712 is about 263.0350062074.

The spelling of 18198712 in words is "eighteen million, one hundred ninety-eight thousand, seven hundred twelve".