180398947 has 4 divisors (see below), whose sum is σ = 180603216. Its totient is φ = 180194680.

The previous prime is 180398891. The next prime is 180398957. The reversal of 180398947 is 749893081.

It is a happy number.

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 180398947 - 2⁷ = 180398819 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 180398947.

It is not an unprimeable number, because it can be changed into a prime (180398957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100804 + ... + 102577.

It is an arithmetic number, because the mean of its divisors is an integer number (45150804).

Almost surely, 2^180398947 is an apocalyptic number.

180398947 is a deficient number, since it is larger than the sum of its proper divisors (204269).

180398947 is an equidigital number, since it uses as much as digits as its factorization.

180398947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204268.

The product of its (nonzero) digits is 435456, while the sum is 49.

The square root of 180398947 is about 13431.2675127852. The cubic root of 180398947 is about 565.0384467533.

The spelling of 180398947 in words is "one hundred eighty million, three hundred ninety-eight thousand, nine hundred forty-seven".