999989086 has 4 divisors (see below), whose sum is σ = 1499983632. Its totient is φ = 499994542.

The previous prime is 999989083. The next prime is 999989087. The reversal of 999989086 is 680989999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 680989999 = 16943 ⋅40193.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999989083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249997270 + ... + 249997273.

It is an arithmetic number, because the mean of its divisors is an integer number (374995908).

Almost surely, 2^999989086 is an apocalyptic number.

999989086 is a deficient number, since it is larger than the sum of its proper divisors (499994546).

999989086 is a wasteful number, since it uses less digits than its factorization.

999989086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499994545.

The product of its (nonzero) digits is 22674816, while the sum is 67.

The square root of 999989086 is about 31622.6040357210. The cubic root of 999989086 is about 999.9963619868.

The spelling of 999989086 in words is "nine hundred ninety-nine million, nine hundred eighty-nine thousand, eighty-six".