999342189 has 12 divisors (see below), whose sum is σ = 1470730716. Its totient is φ = 653657472.

The previous prime is 999342181. The next prime is 999342217. The reversal of 999342189 is 981243999.

It can be written as a sum of positive squares in 2 ways, for example, as 857494089 + 141848100 = 29283^2 + 11910^2 .

It is not a de Polignac number, because 999342189 - 2³ = 999342181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999342181) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1047052 + ... + 1048005.

It is an arithmetic number, because the mean of its divisors is an integer number (122560893).

Almost surely, 2^999342189 is an apocalyptic number.

It is an amenable number.

999342189 is a deficient number, since it is larger than the sum of its proper divisors (471388527).

999342189 is a wasteful number, since it uses less digits than its factorization.

999342189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2095116 (or 2095113 counting only the distinct ones).

The product of its digits is 1259712, while the sum is 54.

The square root of 999342189 is about 31612.3739855140. The cubic root of 999342189 is about 999.7806815696.

The spelling of 999342189 in words is "nine hundred ninety-nine million, three hundred forty-two thousand, one hundred eighty-nine".