899999940000000 has 576 divisors, whose sum is σ = 3421867608746496. Its totient is φ = 205714176000000.

The previous prime is 899999939999971. The next prime is 899999940000059. The reversal of 899999940000000 is 49999998.

It is a happy number.

It is a Cunningham number, because it is equal to 29999999²-1.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 418928572 + ... + 421071428.

It is an arithmetic number, because the mean of its divisors is an integer number (5940742376296).

Almost surely, 2^{899999940000000} is an apocalyptic number.

899999940000000 is a gapful number since it is divisible by the number (80) 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 899999940000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1710933804373248).

899999940000000 is an abundant number, since it is smaller than the sum of its proper divisors (2521867668746496).

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

899999940000000 is an frugal number, since it uses more digits than its factorization.

899999940000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2142918 (or 2142874 counting only the distinct ones).

The product of its (nonzero) digits is 17006112, while the sum is 66.

Adding to 899999940000000 its reverse (49999998), we get a palindrome (899999989999998).

The spelling of 899999940000000 in words is "eight hundred ninety-nine trillion, nine hundred ninety-nine billion, nine hundred forty million", and thus it is an aban number.