398939 has 8 divisors (see below), whose sum is σ = 436608. Its totient is φ = 362880.

The previous prime is 398933. The next prime is 398941. The reversal of 398939 is 939893.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 398939 - 2⁸ = 398683 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 398896 and 398905.

It is not an unprimeable number, because it can be changed into a prime (398933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 149 + ... + 905.

It is an arithmetic number, because the mean of its divisors is an integer number (54576).

2³⁹⁸⁹³⁹ is an apocalyptic number.

398939 is a deficient number, since it is larger than the sum of its proper divisors (37669).

398939 is a wasteful number, since it uses less digits than its factorization.

398939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 805.

The product of its digits is 52488, while the sum is 41.

The square root of 398939 is about 631.6161809200. The cubic root of 398939 is about 73.6154263309.

The spelling of 398939 in words is "three hundred ninety-eight thousand, nine hundred thirty-nine".