189999959 has 4 divisors (see below), whose sum is σ = 192134880. Its totient is φ = 187865040.

The previous prime is 189999949. The next prime is 189999983. The reversal of 189999959 is 959999981.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 189999959 - 2⁸ = 189999703 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189999949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1067327 + ... + 1067504.

It is an arithmetic number, because the mean of its divisors is an integer number (48033720).

Almost surely, 2^189999959 is an apocalyptic number.

189999959 is a deficient number, since it is larger than the sum of its proper divisors (2134921).

189999959 is an equidigital number, since it uses as much as digits as its factorization.

189999959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2134920.

The product of its digits is 21257640, while the sum is 68.

The square root of 189999959 is about 13784.0472648638. The cubic root of 189999959 is about 574.8896665428.

The spelling of 189999959 in words is "one hundred eighty-nine million, nine hundred ninety-nine thousand, nine hundred fifty-nine".