398142878 has 16 divisors (see below), whose sum is σ = 683393760. Its totient is φ = 170416896.

The previous prime is 398142869. The next prime is 398142881. The reversal of 398142878 is 878241893.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6251 + ... + 28902.

It is an arithmetic number, because the mean of its divisors is an integer number (42712110).

Almost surely, 2^398142878 is an apocalyptic number.

398142878 is a deficient number, since it is larger than the sum of its proper divisors (285250882).

398142878 is a wasteful number, since it uses less digits than its factorization.

398142878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35971.

The product of its digits is 774144, while the sum is 50.

The square root of 398142878 is about 19953.5179354419. The cubic root of 398142878 is about 735.6642478014.

The spelling of 398142878 in words is "three hundred ninety-eight million, one hundred forty-two thousand, eight hundred seventy-eight".