398020 has 24 divisors (see below), whose sum is σ = 955584. Its totient is φ = 136416.

The previous prime is 398011. The next prime is 398023. The reversal of 398020 is 20893.

It is a junction number, because it is equal to n+sod(n) for n = 397982 and 398000.

It is not an unprimeable number, because it can be changed into a prime (398023) 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 7 ways as a sum of consecutive naturals, for example, 1282 + ... + 1561.

It is an arithmetic number, because the mean of its divisors is an integer number (39816).

2³⁹⁸⁰²⁰ is an apocalyptic number.

It is an amenable number.

398020 is an abundant number, since it is smaller than the sum of its proper divisors (557564).

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

398020 is a wasteful number, since it uses less digits than its factorization.

398020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2859 (or 2857 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 398020 is about 630.8882626900. Note that the first 3 decimals coincide. The cubic root of 398020 is about 73.5588557844.

The spelling of 398020 in words is "three hundred ninety-eight thousand, twenty".