180721379 has 4 divisors (see below), whose sum is σ = 182584584. Its totient is φ = 178858176.

The previous prime is 180721367. The next prime is 180721397. The reversal of 180721379 is 973127081.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 180721379 - 2¹² = 180717283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (180721309) 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, 931457 + ... + 931650.

It is an arithmetic number, because the mean of its divisors is an integer number (45646146).

Almost surely, 2^180721379 is an apocalyptic number.

180721379 is a deficient number, since it is larger than the sum of its proper divisors (1863205).

180721379 is an equidigital number, since it uses as much as digits as its factorization.

180721379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1863204.

The product of its (nonzero) digits is 21168, while the sum is 38.

The square root of 180721379 is about 13443.2651911654. The cubic root of 180721379 is about 565.3748826451.

The spelling of 180721379 in words is "one hundred eighty million, seven hundred twenty-one thousand, three hundred seventy-nine".