398722194 has 24 divisors (see below), whose sum is σ = 930352332. Its totient is φ = 122683680.

The previous prime is 398722193. The next prime is 398722213. The reversal of 398722194 is 491227893.

398722194 is a `hidden beast` number, since 398 + 72 + 2 + 194 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 363474225 + 35247969 = 19065^2 + 5937^2 .

It is not an unprimeable number, because it can be changed into a prime (398722193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 851737 + ... + 852204.

Almost surely, 2^398722194 is an apocalyptic number.

398722194 is an abundant number, since it is smaller than the sum of its proper divisors (531630138).

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

398722194 is a wasteful number, since it uses less digits than its factorization.

398722194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1703962 (or 1703959 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 398722194 is about 19968.0292968535. The cubic root of 398722194 is about 736.0208831996.

The spelling of 398722194 in words is "three hundred ninety-eight million, seven hundred twenty-two thousand, one hundred ninety-four".