195891823 has 4 divisors (see below), whose sum is σ = 197831448. Its totient is φ = 193952200.

The previous prime is 195891811. The next prime is 195891827. The reversal of 195891823 is 328198591.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 195891823 - 2¹³ = 195883631 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 (195891827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 969661 + ... + 969862.

It is an arithmetic number, because the mean of its divisors is an integer number (49457862).

Almost surely, 2^195891823 is an apocalyptic number.

195891823 is a deficient number, since it is larger than the sum of its proper divisors (1939625).

195891823 is a wasteful number, since it uses less digits than its factorization.

195891823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1939624.

The product of its digits is 155520, while the sum is 46.

The square root of 195891823 is about 13996.1360024830. The cubic root of 195891823 is about 580.7716868504.

It can be divided in two parts, 19589 and 1823, that added together give a palindrome (21412).

The spelling of 195891823 in words is "one hundred ninety-five million, eight hundred ninety-one thousand, eight hundred twenty-three".