195977838 has 16 divisors (see below), whose sum is σ = 447949440. Its totient is φ = 55993656.

The previous prime is 195977833. The next prime is 195977839. The reversal of 195977838 is 838779591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195977833) 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, 2333028 + ... + 2333111.

It is an arithmetic number, because the mean of its divisors is an integer number (27996840).

Almost surely, 2^195977838 is an apocalyptic number.

195977838 is an abundant number, since it is smaller than the sum of its proper divisors (251971602).

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

195977838 is a wasteful number, since it uses less digits than its factorization.

195977838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4666151.

The product of its digits is 3810240, while the sum is 57.

The square root of 195977838 is about 13999.2084776247. The cubic root of 195977838 is about 580.8566789411.

It can be divided in two parts, 1959 and 77838, that added together give a palindrome (79797).

The spelling of 195977838 in words is "one hundred ninety-five million, nine hundred seventy-seven thousand, eight hundred thirty-eight".