18019172 has 12 divisors (see below), whose sum is σ = 32302956. Its totient is φ = 8789760.

The previous prime is 18019159. The next prime is 18019223. The reversal of 18019172 is 27191081.

It can be written as a sum of positive squares in 2 ways, for example, as 1503076 + 16516096 = 1226^2 + 4064^2 .

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, 54773 + ... + 55100.

It is an arithmetic number, because the mean of its divisors is an integer number (2691913).

Almost surely, 2^18019172 is an apocalyptic number.

It is an amenable number.

18019172 is a deficient number, since it is larger than the sum of its proper divisors (14283784).

18019172 is a wasteful number, since it uses less digits than its factorization.

18019172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109918 (or 109916 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 29.

The square root of 18019172 is about 4244.8995276685. The cubic root of 18019172 is about 262.1671524316.

The spelling of 18019172 in words is "eighteen million, nineteen thousand, one hundred seventy-two".