398390839 has 8 divisors (see below), whose sum is σ = 496695168. Its totient is φ = 310434360.

The previous prime is 398390831. The next prime is 398390851. The reversal of 398390839 is 938093893.

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 398390839 - 2³ = 398390831 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 (398390831) 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, 2586877 + ... + 2587030.

It is an arithmetic number, because the mean of its divisors is an integer number (62086896).

Almost surely, 2^398390839 is an apocalyptic number.

398390839 is a deficient number, since it is larger than the sum of its proper divisors (98304329).

398390839 is a wasteful number, since it uses less digits than its factorization.

398390839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5173925.

The product of its (nonzero) digits is 1259712, while the sum is 52.

The square root of 398390839 is about 19959.7304340515. The cubic root of 398390839 is about 735.8169385367.

The spelling of 398390839 in words is "three hundred ninety-eight million, three hundred ninety thousand, eight hundred thirty-nine".