18117234 has 12 divisors (see below), whose sum is σ = 39254046. Its totient is φ = 6039072.

The previous prime is 18117227. The next prime is 18117251. The reversal of 18117234 is 43271181.

It can be written as a sum of positive squares in only one way, i.e., 13068225 + 5049009 = 3615^2 + 2247^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18117198 and 18117207.

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 5 ways as a sum of consecutive naturals, for example, 503239 + ... + 503274.

Almost surely, 2^18117234 is an apocalyptic number.

18117234 is an abundant number, since it is smaller than the sum of its proper divisors (21136812).

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

18117234 is a wasteful number, since it uses less digits than its factorization.

18117234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1006521 (or 1006518 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 18117234 is about 4256.4344233172. The cubic root of 18117234 is about 262.6418716091.

It can be divided in two parts, 1811 and 7234, that added together give a triangular number (9045 = T₁₃₄).

The spelling of 18117234 in words is "eighteen million, one hundred seventeen thousand, two hundred thirty-four".