180005869 has 4 divisors (see below), whose sum is σ = 184192096. Its totient is φ = 175819644.

The previous prime is 180005773. The next prime is 180005887. The reversal of 180005869 is 968500081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-180005869 is a prime.

It is a super-2 number, since 2×180005869² = 64804225748890322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (180005569) 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, 2093049 + ... + 2093134.

It is an arithmetic number, because the mean of its divisors is an integer number (46048024).

Almost surely, 2^180005869 is an apocalyptic number.

It is an amenable number.

180005869 is a deficient number, since it is larger than the sum of its proper divisors (4186227).

180005869 is an equidigital number, since it uses as much as digits as its factorization.

180005869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4186226.

The product of its (nonzero) digits is 17280, while the sum is 37.

The square root of 180005869 is about 13416.6265879319. The cubic root of 180005869 is about 564.6277538624.

The spelling of 180005869 in words is "one hundred eighty million, five thousand, eight hundred sixty-nine".