398328979 has 4 divisors (see below), whose sum is σ = 398388520. Its totient is φ = 398269440.

The previous prime is 398328967. The next prime is 398329031. The reversal of 398328979 is 979823893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 979823893 = 6073 ⋅161341.

It is a cyclic number.

It is not a de Polignac number, because 398328979 - 2²³ = 389940371 is a prime.

It is a super-2 number, since 2×398328979² = 317331951022364882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398328919) 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, 18249 + ... + 33610.

It is an arithmetic number, because the mean of its divisors is an integer number (99597130).

Almost surely, 2^398328979 is an apocalyptic number.

398328979 is a deficient number, since it is larger than the sum of its proper divisors (59541).

398328979 is an equidigital number, since it uses as much as digits as its factorization.

398328979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59540.

The product of its digits is 5878656, while the sum is 58.

The square root of 398328979 is about 19958.1807537661. The cubic root of 398328979 is about 735.7788519916.

The spelling of 398328979 in words is "three hundred ninety-eight million, three hundred twenty-eight thousand, nine hundred seventy-nine".