195998279 has 6 divisors (see below), whose sum is σ = 197219136. Its totient is φ = 194779640.

The previous prime is 195998267. The next prime is 195998291. The reversal of 195998279 is 972899591.

It is an interprime number because it is at equal distance from previous prime (195998267) and next prime (195998291).

It is not a de Polignac number, because 195998279 - 2¹⁶ = 195932743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195998239) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 192977 + ... + 193989.

It is an arithmetic number, because the mean of its divisors is an integer number (32869856).

Almost surely, 2^195998279 is an apocalyptic number.

195998279 is a deficient number, since it is larger than the sum of its proper divisors (1220857).

195998279 is an frugal number, since it uses more digits than its factorization.

195998279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2217 (or 1204 counting only the distinct ones).

The product of its digits is 3674160, while the sum is 59.

The square root of 195998279 is about 13999.9385355794. The cubic root of 195998279 is about 580.8768731949.

The spelling of 195998279 in words is "one hundred ninety-five million, nine hundred ninety-eight thousand, two hundred seventy-nine".