195715978 has 8 divisors (see below), whose sum is σ = 297955872. Its totient is φ = 96397356.

The previous prime is 195715967. The next prime is 195715987. The reversal of 195715978 is 879517591.

It is a happy number.

195715978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 730150 + ... + 730417.

It is an arithmetic number, because the mean of its divisors is an integer number (37244484).

Almost surely, 2^195715978 is an apocalyptic number.

195715978 is a deficient number, since it is larger than the sum of its proper divisors (102239894).

195715978 is a wasteful number, since it uses less digits than its factorization.

195715978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1460636.

The product of its digits is 793800, while the sum is 52.

The square root of 195715978 is about 13989.8526797104. The cubic root of 195715978 is about 580.5978555845.

The spelling of 195715978 in words is "one hundred ninety-five million, seven hundred fifteen thousand, nine hundred seventy-eight".