180999 has 36 divisors (see below), whose sum is σ = 342576. Its totient is φ = 89856.

The previous prime is 180959. The next prime is 181001. The reversal of 180999 is 999081.

180999 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 180999 - 2⁷ = 180871 is a prime.

It is an Ulam number.

180999 is a modest number, since divided by 999 gives 180 as remainder.

180999 is strictly pandigital in base 7.

180999 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (180949) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 10639 + ... + 10655.

It is an arithmetic number, because the mean of its divisors is an integer number (9516).

2¹⁸⁰⁹⁹⁹ is an apocalyptic number.

180999 is a deficient number, since it is larger than the sum of its proper divisors (161577).

180999 is a wasteful number, since it uses less digits than its factorization.

180999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56 (or 40 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The square root of 180999 is about 425.4397724708. The cubic root of 180999 is about 56.5664240840.

The spelling of 180999 in words is "one hundred eighty thousand, nine hundred ninety-nine".