180820399 has 8 divisors (see below), whose sum is σ = 181822320. Its totient is φ = 179822016.

The previous prime is 180820379. The next prime is 180820417. The reversal of 180820399 is 993028081.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 180820399 - 2¹³ = 180812207 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 (180820379) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 223107 + ... + 223915.

It is an arithmetic number, because the mean of its divisors is an integer number (22727790).

Almost surely, 2^180820399 is an apocalyptic number.

180820399 is a deficient number, since it is larger than the sum of its proper divisors (1001921).

180820399 is an equidigital number, since it uses as much as digits as its factorization.

180820399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1769.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 180820399 is about 13446.9475718469. The cubic root of 180820399 is about 565.4781229656.

The spelling of 180820399 in words is "one hundred eighty million, eight hundred twenty thousand, three hundred ninety-nine".