18166434 has 64 divisors (see below), whose sum is σ = 44126208. Its totient is φ = 4910400.

The previous prime is 18166433. The next prime is 18166453. The reversal of 18166434 is 43466181.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 18166395 and 18166404.

It is not an unprimeable number, because it can be changed into a prime (18166433) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26257 + ... + 26939.

It is an arithmetic number, because the mean of its divisors is an integer number (689472).

Almost surely, 2^18166434 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18166434, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22063104).

18166434 is an abundant number, since it is smaller than the sum of its proper divisors (25959774).

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

18166434 is a wasteful number, since it uses less digits than its factorization.

18166434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 743.

The product of its digits is 13824, while the sum is 33.

The square root of 18166434 is about 4262.2099901342. The cubic root of 18166434 is about 262.8794041987.

The spelling of 18166434 in words is "eighteen million, one hundred sixty-six thousand, four hundred thirty-four".