180055399 has 4 divisors (see below), whose sum is σ = 180960400. Its totient is φ = 179150400.

The previous prime is 180055391. The next prime is 180055417. The reversal of 180055399 is 993550081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 993550081 = 401 ⋅2477681.

It is a cyclic number.

It is not a de Polignac number, because 180055399 - 2³ = 180055391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (180055391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 452202 + ... + 452599.

It is an arithmetic number, because the mean of its divisors is an integer number (45240100).

Almost surely, 2^180055399 is an apocalyptic number.

180055399 is a deficient number, since it is larger than the sum of its proper divisors (905001).

180055399 is an equidigital number, since it uses as much as digits as its factorization.

180055399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 905000.

The product of its (nonzero) digits is 48600, while the sum is 40.

The square root of 180055399 is about 13418.4723049981. The cubic root of 180055399 is about 564.6795363370.

The spelling of 180055399 in words is "one hundred eighty million, fifty-five thousand, three hundred ninety-nine".