398679 has 4 divisors (see below), whose sum is σ = 531576. Its totient is φ = 265784.

The previous prime is 398669. The next prime is 398681. The reversal of 398679 is 976893.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 976893 = 3 ⋅325631.

It is a cyclic number.

It is not a de Polignac number, because 398679 - 2⁸ = 398423 is a prime.

It is a D-number.

It is a nialpdrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 398679.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66444 + ... + 66449.

It is an arithmetic number, because the mean of its divisors is an integer number (132894).

2³⁹⁸⁶⁷⁹ is an apocalyptic number.

398679 is a deficient number, since it is larger than the sum of its proper divisors (132897).

398679 is a wasteful number, since it uses less digits than its factorization.

398679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132896.

The product of its digits is 81648, while the sum is 42.

The square root of 398679 is about 631.4103261747. The cubic root of 398679 is about 73.5994304264.

The spelling of 398679 in words is "three hundred ninety-eight thousand, six hundred seventy-nine".