999999189 has 64 divisors (see below), whose sum is σ = 1736878080. Its totient is φ = 563826096.

The previous prime is 999999181. The next prime is 999999191. The reversal of 999999189 is 981999999.

It is a happy number.

It is not a de Polignac number, because 999999189 - 2³ = 999999181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999999181) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1270254 + ... + 1271040.

It is an arithmetic number, because the mean of its divisors is an integer number (27138720).

Almost surely, 2^999999189 is an apocalyptic number.

It is an amenable number.

999999189 is a deficient number, since it is larger than the sum of its proper divisors (736878891).

999999189 is an frugal number, since it uses more digits than its factorization.

999999189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 898 (or 880 counting only the distinct ones).

The product of its digits is 38263752, while the sum is 72.

The square root of 999999189 is about 31622.7637786453. The cubic root of 999999189 is about 999.9997296666. Note that the first 3 decimals are identical.

The spelling of 999999189 in words is "nine hundred ninety-nine million, nine hundred ninety-nine thousand, one hundred eighty-nine".