180806399 has 4 divisors (see below), whose sum is σ = 183353040. Its totient is φ = 178259760.

The previous prime is 180806389. The next prime is 180806411. The reversal of 180806399 is 993608081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 993608081 = 487 ⋅2040263.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-180806399 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 (180806389) 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, 1273214 + ... + 1273355.

It is an arithmetic number, because the mean of its divisors is an integer number (45838260).

Almost surely, 2^180806399 is an apocalyptic number.

180806399 is a deficient number, since it is larger than the sum of its proper divisors (2546641).

180806399 is an equidigital number, since it uses as much as digits as its factorization.

180806399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2546640.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 180806399 is about 13446.4269975336. The cubic root of 180806399 is about 565.4635285612.

The spelling of 180806399 in words is "one hundred eighty million, eight hundred six thousand, three hundred ninety-nine".