198436393444 has 9 divisors (see below), whose sum is σ = 347265247651. Its totient is φ = 99217751260.

The previous prime is 198436393423. The next prime is 198436393447. The reversal of 198436393444 is 444393634891.

The square root of 198436393444 is 445462.

It is a perfect power (a square), and thus also a powerful number.

198436393444 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×198436393444² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198436393447) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 779559 + ... + 1002289.

Almost surely, 2^198436393444 is an apocalyptic number.

198436393444 is the 445462-nd square number.

It is an amenable number.

198436393444 is a deficient number, since it is larger than the sum of its proper divisors (148828854207).

198436393444 is an frugal number, since it uses more digits than its factorization.

198436393444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445466 (or 222733 counting only the distinct ones).

The product of its digits is 26873856, while the sum is 58.

The spelling of 198436393444 in words is "one hundred ninety-eight billion, four hundred thirty-six million, three hundred ninety-three thousand, four hundred forty-four".