180021198 has 24 divisors (see below), whose sum is σ = 418825512. Its totient is φ = 51434544.

The previous prime is 180021197. The next prime is 180021199. The reversal of 180021198 is 891120081.

180021198 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (180021197) and next prime (180021199).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (180021197) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 305865 + ... + 306452.

It is an arithmetic number, because the mean of its divisors is an integer number (17451063).

Almost surely, 2^180021198 is an apocalyptic number.

180021198 is an abundant number, since it is smaller than the sum of its proper divisors (238804314).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

180021198 is a wasteful number, since it uses less digits than its factorization.

180021198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612336 (or 612329 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 30.

The square root of 180021198 is about 13417.1978445576. The cubic root of 180021198 is about 564.6437809939.

The spelling of 180021198 in words is "one hundred eighty million, twenty-one thousand, one hundred ninety-eight".