198905644 has 24 divisors (see below), whose sum is σ = 421212960. Its totient is φ = 80230656.

The previous prime is 198905621. The next prime is 198905711. The reversal of 198905644 is 446509891.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 198905594 and 198905603.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 208459 + ... + 209410.

It is an arithmetic number, because the mean of its divisors is an integer number (17550540).

Almost surely, 2^198905644 is an apocalyptic number.

198905644 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

198905644 is an abundant number, since it is smaller than the sum of its proper divisors (222307316).

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

198905644 is a wasteful number, since it uses less digits than its factorization.

198905644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417897 (or 417895 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 46.

The square root of 198905644 is about 14103.3912233902. The cubic root of 198905644 is about 583.7349574507.

The spelling of 198905644 in words is "one hundred ninety-eight million, nine hundred five thousand, six hundred forty-four".