189995805 has 24 divisors (see below), whose sum is σ = 330178680. Its totient is φ = 101068800.

The previous prime is 189995803. The next prime is 189995833. The reversal of 189995805 is 508599981.

It can be written as a sum of positive squares in 4 ways, for example, as 103673124 + 86322681 = 10182^2 + 9291^2 .

It is not a de Polignac number, because 189995805 - 2¹ = 189995803 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189995803) 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, 12781 + ... + 23309.

It is an arithmetic number, because the mean of its divisors is an integer number (13757445).

Almost surely, 2^189995805 is an apocalyptic number.

189995805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

189995805 is a deficient number, since it is larger than the sum of its proper divisors (140182875).

189995805 is a wasteful number, since it uses less digits than its factorization.

189995805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10941 (or 10938 counting only the distinct ones).

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

The square root of 189995805 is about 13783.8965826068. The cubic root of 189995805 is about 574.8854768768.

The spelling of 189995805 in words is "one hundred eighty-nine million, nine hundred ninety-five thousand, eight hundred five".