195390878 has 4 divisors (see below), whose sum is σ = 293086320. Its totient is φ = 97695438.

The previous prime is 195390857. The next prime is 195390901. The reversal of 195390878 is 878093591.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 878093591 = 211 ⋅4161581.

It is a super-2 number, since 2×195390878² = 76355190411221768, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48847718 + ... + 48847721.

It is an arithmetic number, because the mean of its divisors is an integer number (73271580).

Almost surely, 2^195390878 is an apocalyptic number.

195390878 is a deficient number, since it is larger than the sum of its proper divisors (97695442).

195390878 is an equidigital number, since it uses as much as digits as its factorization.

195390878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97695441.

The product of its (nonzero) digits is 544320, while the sum is 50.

The square root of 195390878 is about 13978.2287146834. The cubic root of 195390878 is about 580.2762041583.

The spelling of 195390878 in words is "one hundred ninety-five million, three hundred ninety thousand, eight hundred seventy-eight".