189995806 has 32 divisors (see below), whose sum is σ = 382652928. Its totient is φ = 68329440.

The previous prime is 189995803. The next prime is 189995833. The reversal of 189995806 is 608599981.

189995806 = 4151² + 4152² + ... + 4161².

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 15 ways as a sum of consecutive naturals, for example, 45450 + ... + 49453.

It is an arithmetic number, because the mean of its divisors is an integer number (11957904).

Almost surely, 2^189995806 is an apocalyptic number.

189995806 is an abundant number, since it is smaller than the sum of its proper divisors (192657122).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

189995806 is a wasteful number, since it uses less digits than its factorization.

189995806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94936.

The product of its (nonzero) digits is 1399680, while the sum is 55.

The square root of 189995806 is about 13783.8966188810. The cubic root of 189995806 is about 574.8854778854.

The spelling of 189995806 in words is "one hundred eighty-nine million, nine hundred ninety-five thousand, eight hundred six".