398980 has 12 divisors (see below), whose sum is σ = 837900. Its totient is φ = 159584.

The previous prime is 398977. The next prime is 398989. The reversal of 398980 is 89893.

It can be written as a sum of positive squares in 2 ways, for example, as 87616 + 311364 = 296^2 + 558^2 .

It is not an unprimeable number, because it can be changed into a prime (398989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9955 + ... + 9994.

It is an arithmetic number, because the mean of its divisors is an integer number (69825).

2³⁹⁸⁹⁸⁰ is an apocalyptic number.

It is an amenable number.

398980 is an abundant number, since it is smaller than the sum of its proper divisors (438920).

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

398980 is a wasteful number, since it uses less digits than its factorization.

398980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19958 (or 19956 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 398980 is about 631.6486365061. The cubic root of 398980 is about 73.6179481275.

It can be divided in two parts, 398 and 980, that added together give a triangular number (1378 = T₅₂).

The spelling of 398980 in words is "three hundred ninety-eight thousand, nine hundred eighty".