398478824874 has 24 divisors (see below), whose sum is σ = 929783925252. Its totient is φ = 122608869120.

The previous prime is 398478824839. The next prime is 398478824987. The reversal of 398478824874 is 478428874893.

It is a happy number.

398478824874 is a `hidden beast` number, since 3 + 9 + 8 + 478 + 82 + 4 + 8 + 74 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 389259944649 + 9218880225 = 623907^2 + 96015^2 .

It is a super-2 number, since 2×398478824874² (a number of 24 digits) contains 22 as substring.

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 11 ways as a sum of consecutive naturals, for example, 851450247 + ... + 851450714.

Almost surely, 2^398478824874 is an apocalyptic number.

398478824874 is an abundant number, since it is smaller than the sum of its proper divisors (531305100378).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

398478824874 is a wasteful number, since it uses less digits than its factorization.

398478824874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1702900982 (or 1702900979 counting only the distinct ones).

The product of its digits is 693633024, while the sum is 72.

The spelling of 398478824874 in words is "three hundred ninety-eight billion, four hundred seventy-eight million, eight hundred twenty-four thousand, eight hundred seventy-four".