398979 has 16 divisors (see below), whose sum is σ = 675840. Its totient is φ = 227880.

The previous prime is 398977. The next prime is 398989. The reversal of 398979 is 979893.

It is a happy number.

It is not a de Polignac number, because 398979 - 2¹ = 398977 is a prime.

It is an Ulam number.

398979 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (398977) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 867 + ... + 1244.

It is an arithmetic number, because the mean of its divisors is an integer number (42240).

2³⁹⁸⁹⁷⁹ is an apocalyptic number.

398979 is a deficient number, since it is larger than the sum of its proper divisors (276861).

398979 is a wasteful number, since it uses less digits than its factorization.

398979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2127 (or 2121 counting only the distinct ones).

The product of its digits is 122472, while the sum is 45.

The square root of 398979 is about 631.6478449263. The cubic root of 398979 is about 73.6178866224.

The spelling of 398979 in words is "three hundred ninety-eight thousand, nine hundred seventy-nine".