18019212 has 24 divisors (see below), whose sum is σ = 43873536. Its totient is φ = 5745168.

The previous prime is 18019159. The next prime is 18019223. The reversal of 18019212 is 21291081.

It is a super-2 number, since 2×18019212² = 649384002201888, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32368 + ... + 32919.

It is an arithmetic number, because the mean of its divisors is an integer number (1828064).

Almost surely, 2^18019212 is an apocalyptic number.

18019212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18019212 is an abundant number, since it is smaller than the sum of its proper divisors (25854324).

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

18019212 is a wasteful number, since it uses less digits than its factorization.

18019212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65317 (or 65315 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 24.

The square root of 18019212 is about 4244.9042392026. The cubic root of 18019212 is about 262.1673464227.

The spelling of 18019212 in words is "eighteen million, nineteen thousand, two hundred twelve".