18173142 has 48 divisors (see below), whose sum is σ = 43570800. Its totient is φ = 5438016.

The previous prime is 18173137. The next prime is 18173143. The reversal of 18173142 is 24137181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18173143) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7609 + ... + 9707.

It is an arithmetic number, because the mean of its divisors is an integer number (907725).

Almost surely, 2^18173142 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18173142, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21785400).

18173142 is an abundant number, since it is smaller than the sum of its proper divisors (25397658).

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

18173142 is a wasteful number, since it uses less digits than its factorization.

18173142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2157 (or 2154 counting only the distinct ones).

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

The square root of 18173142 is about 4262.9968332149. The cubic root of 18173142 is about 262.9117565037.

Adding to 18173142 its sum of digits (27), we get a square (18173169 = 4263²).

The spelling of 18173142 in words is "eighteen million, one hundred seventy-three thousand, one hundred forty-two".