198772839 has 8 divisors (see below), whose sum is σ = 294478320. Its totient is φ = 132515208.

The previous prime is 198772817. The next prime is 198772883. The reversal of 198772839 is 938277891.

198772839 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 198772839 - 2¹³ = 198764647 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198772939) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3680952 + ... + 3681005.

It is an arithmetic number, because the mean of its divisors is an integer number (36809790).

Almost surely, 2^198772839 is an apocalyptic number.

198772839 is a deficient number, since it is larger than the sum of its proper divisors (95705481).

198772839 is an equidigital number, since it uses as much as digits as its factorization.

198772839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7361966 (or 7361960 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 54.

The square root of 198772839 is about 14098.6821724585. The cubic root of 198772839 is about 583.6050127873.

The spelling of 198772839 in words is "one hundred ninety-eight million, seven hundred seventy-two thousand, eight hundred thirty-nine".