198279965 has 16 divisors (see below), whose sum is σ = 257596416. Its totient is φ = 145646400.

The previous prime is 198279919. The next prime is 198279973. The reversal of 198279965 is 569972891.

198279965 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-198279965 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 198279965.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4430 + ... + 20400.

It is an arithmetic number, because the mean of its divisors is an integer number (16099776).

Almost surely, 2^198279965 is an apocalyptic number.

It is an amenable number.

198279965 is a deficient number, since it is larger than the sum of its proper divisors (59316451).

198279965 is a wasteful number, since it uses less digits than its factorization.

198279965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16180.

The product of its digits is 2449440, while the sum is 56.

The square root of 198279965 is about 14081.1918884731. The cubic root of 198279965 is about 583.1222476164.

It can be divided in two parts, 19827 and 9965, that added together give a palindrome (29792).

The spelling of 198279965 in words is "one hundred ninety-eight million, two hundred seventy-nine thousand, nine hundred sixty-five".