195988905 has 24 divisors (see below), whose sum is σ = 388245312. Its totient is φ = 89594784.

The previous prime is 195988901. The next prime is 195988921. The reversal of 195988905 is 509889591.

It is not a de Polignac number, because 195988905 - 2² = 195988901 is a prime.

It is not an unprimeable number, because it can be changed into a prime (195988901) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 310779 + ... + 311408.

It is an arithmetic number, because the mean of its divisors is an integer number (16176888).

Almost surely, 2^195988905 is an apocalyptic number.

195988905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

195988905 is a deficient number, since it is larger than the sum of its proper divisors (192256407).

195988905 is a wasteful number, since it uses less digits than its factorization.

195988905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622205 (or 622202 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 54.

The square root of 195988905 is about 13999.6037443922. The cubic root of 195988905 is about 580.8676125241.

The spelling of 195988905 in words is "one hundred ninety-five million, nine hundred eighty-eight thousand, nine hundred five".