18168434 has 4 divisors (see below), whose sum is σ = 27252654. Its totient is φ = 9084216.

The previous prime is 18168433. The next prime is 18168439. The reversal of 18168434 is 43486181.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 14462809 + 3705625 = 3803^2 + 1925^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18168394 and 18168403.

It is not an unprimeable number, because it can be changed into a prime (18168433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4542107 + ... + 4542110.

Almost surely, 2^18168434 is an apocalyptic number.

18168434 is a deficient number, since it is larger than the sum of its proper divisors (9084220).

18168434 is an equidigital number, since it uses as much as digits as its factorization.

18168434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9084219.

The product of its digits is 18432, while the sum is 35.

The square root of 18168434 is about 4262.4446037456. Note that the first 3 decimals coincide. The cubic root of 18168434 is about 262.8890509188.

The spelling of 18168434 in words is "eighteen million, one hundred sixty-eight thousand, four hundred thirty-four".