18722133 has 6 divisors (see below), whose sum is σ = 27043094. Its totient is φ = 12481416.

The previous prime is 18722113. The next prime is 18722149. The reversal of 18722133 is 33122781.

It can be written as a sum of positive squares in only one way, i.e., 14424804 + 4297329 = 3798^2 + 2073^2 .

It is not a de Polignac number, because 18722133 - 2⁵ = 18722101 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18722097 and 18722106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18722113) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1040110 + ... + 1040127.

Almost surely, 2^18722133 is an apocalyptic number.

It is an amenable number.

18722133 is a deficient number, since it is larger than the sum of its proper divisors (8320961).

18722133 is a wasteful number, since it uses less digits than its factorization.

18722133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2080243 (or 2080240 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 18722133 is about 4326.9080184353. The cubic root of 18722133 is about 265.5329632325.

It can be divided in two parts, 1872 and 2133, that added together give a triangular number (4005 = T₈₉).

The spelling of 18722133 in words is "eighteen million, seven hundred twenty-two thousand, one hundred thirty-three".