398139 has 8 divisors (see below), whose sum is σ = 606720. Its totient is φ = 227496.

The previous prime is 398129. The next prime is 398143. The reversal of 398139 is 931893.

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

It is not a de Polignac number, because 398139 - 2⁷ = 398011 is a prime.

398139 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 398139.

It is not an unprimeable number, because it can be changed into a prime (398119) 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, 9459 + ... + 9500.

It is an arithmetic number, because the mean of its divisors is an integer number (75840).

2³⁹⁸¹³⁹ is an apocalyptic number.

398139 is a deficient number, since it is larger than the sum of its proper divisors (208581).

398139 is a wasteful number, since it uses less digits than its factorization.

398139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18969.

The product of its digits is 5832, while the sum is 33.

The square root of 398139 is about 630.9825671126. The cubic root of 398139 is about 73.5661859283.

The spelling of 398139 in words is "three hundred ninety-eight thousand, one hundred thirty-nine".