195809690 has 16 divisors (see below), whose sum is σ = 352643328. Its totient is φ = 78282576.

The previous prime is 195809683. The next prime is 195809737. The reversal of 195809690 is 96908591.

It is a super-2 number, since 2×195809690² = 76682869395792200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21119 + ... + 28941.

It is an arithmetic number, because the mean of its divisors is an integer number (22040208).

Almost surely, 2^195809690 is an apocalyptic number.

195809690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

195809690 is a deficient number, since it is larger than the sum of its proper divisors (156833638).

195809690 is a wasteful number, since it uses less digits than its factorization.

195809690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10333.

The product of its (nonzero) digits is 174960, while the sum is 47.

The square root of 195809690 is about 13993.2015636165. The cubic root of 195809690 is about 580.6905073702.

The spelling of 195809690 in words is "one hundred ninety-five million, eight hundred nine thousand, six hundred ninety".