398142879 has 8 divisors (see below), whose sum is σ = 530952240. Its totient is φ = 265381056.

The previous prime is 398142869. The next prime is 398142881. The reversal of 398142879 is 978241893.

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

It is not a de Polignac number, because 398142879 - 2¹³ = 398134687 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398142859) 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, 19509 + ... + 34305.

It is an arithmetic number, because the mean of its divisors is an integer number (66369030).

Almost surely, 2^398142879 is an apocalyptic number.

398142879 is a deficient number, since it is larger than the sum of its proper divisors (132809361).

398142879 is a wasteful number, since it uses less digits than its factorization.

398142879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23769.

The product of its digits is 870912, while the sum is 51.

The square root of 398142879 is about 19953.5179605001. The cubic root of 398142879 is about 735.6642484173.

The spelling of 398142879 in words is "three hundred ninety-eight million, one hundred forty-two thousand, eight hundred seventy-nine".