398877574838 has 4 divisors (see below), whose sum is σ = 598316362260. Its totient is φ = 199438787418.

The previous prime is 398877574807. The next prime is 398877574841. The reversal of 398877574838 is 838475778893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 838475778893 = 183571 ⋅4567583.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99719393708 + ... + 99719393711.

It is an arithmetic number, because the mean of its divisors is an integer number (149579090565).

Almost surely, 2^398877574838 is an apocalyptic number.

398877574838 is a deficient number, since it is larger than the sum of its proper divisors (199438787422).

398877574838 is a wasteful number, since it uses less digits than its factorization.

398877574838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199438787421.

The product of its digits is 2275983360, while the sum is 77.

The spelling of 398877574838 in words is "three hundred ninety-eight billion, eight hundred seventy-seven million, five hundred seventy-four thousand, eight hundred thirty-eight".