398398842 has 24 divisors (see below), whose sum is σ = 913974516. Its totient is φ = 124987776.

The previous prime is 398398841. The next prime is 398398867. The reversal of 398398842 is 248893893.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 390497121 + 7901721 = 19761^2 + 2811^2 .

It is not an unprimeable number, because it can be changed into a prime (398398841) by changing a digit.

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, 650673 + ... + 651284.

Almost surely, 2^398398842 is an apocalyptic number.

398398842 is an abundant number, since it is smaller than the sum of its proper divisors (515575674).

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

398398842 is a wasteful number, since it uses less digits than its factorization.

398398842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1301982 (or 1301979 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 54.

The square root of 398398842 is about 19959.9309117041. The cubic root of 398398842 is about 735.8218656108.

The spelling of 398398842 in words is "three hundred ninety-eight million, three hundred ninety-eight thousand, eight hundred forty-two".