398046839 has 4 divisors (see below), whose sum is σ = 398172456. Its totient is φ = 397921224.

The previous prime is 398046833. The next prime is 398046871. The reversal of 398046839 is 938640893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 938640893 = 20887 ⋅44939.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-398046839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398046833) 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, 57929 + ... + 64434.

It is an arithmetic number, because the mean of its divisors is an integer number (99543114).

Almost surely, 2^398046839 is an apocalyptic number.

398046839 is a deficient number, since it is larger than the sum of its proper divisors (125617).

398046839 is a wasteful number, since it uses less digits than its factorization.

398046839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125616.

The product of its (nonzero) digits is 1119744, while the sum is 50.

The square root of 398046839 is about 19951.1112221851. Note that the first 3 decimals coincide. The cubic root of 398046839 is about 735.6050913660.

The spelling of 398046839 in words is "three hundred ninety-eight million, forty-six thousand, eight hundred thirty-nine".