999999612 has 72 divisors (see below), whose sum is σ = 2722836480. Its totient is φ = 308547360.

The previous prime is 999999607. The next prime is 999999613. The reversal of 999999612 is 216999999.

999999612 is a `hidden beast` number, since 9 + 9 + 9 + 9 + 9 + 9 + 612 = 666.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 999999612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999999613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6189 + ... + 45147.

Almost surely, 2^999999612 is an apocalyptic number.

999999612 is a gapful number since it is divisible by the number (92) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999999612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1361418240).

999999612 is an abundant number, since it is smaller than the sum of its proper divisors (1722836868).

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

999999612 is a wasteful number, since it uses less digits than its factorization.

999999612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39023 (or 39018 counting only the distinct ones).

The product of its digits is 6377292, while the sum is 63.

The square root of 999999612 is about 31622.7704668645. The cubic root of 999999612 is about 999.9998706666. Note that the first 3 decimals are identical.

The spelling of 999999612 in words is "nine hundred ninety-nine million, nine hundred ninety-nine thousand, six hundred twelve".