398666842 has 40 divisors (see below), whose sum is σ = 709582932. Its totient is φ = 167932800.

The previous prime is 398666837. The next prime is 398666869. The reversal of 398666842 is 248666893.

It can be written as a sum of positive squares in 2 ways, for example, as 312900721 + 85766121 = 17689^2 + 9261^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 398666842.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 292242 + ... + 293602.

Almost surely, 2^398666842 is an apocalyptic number.

398666842 is a deficient number, since it is larger than the sum of its proper divisors (310916090).

398666842 is an equidigital number, since it uses as much as digits as its factorization.

398666842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1452 (or 1431 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 52.

The square root of 398666842 is about 19966.6432331526. The cubic root of 398666842 is about 735.9868226315.

The spelling of 398666842 in words is "three hundred ninety-eight million, six hundred sixty-six thousand, eight hundred forty-two".