990012143800 has 96 divisors (see below), whose sum is σ = 2316813634080. Its totient is φ = 393423667200.

The previous prime is 990012143749. The next prime is 990012143801. The reversal of 990012143800 is 8341210099.

It is a self number, because there is not a number n which added to its sum of digits gives 990012143800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990012143801) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29357749 + ... + 29391451.

It is an arithmetic number, because the mean of its divisors is an integer number (24133475355).

Almost surely, 2^990012143800 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 990012143800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1158406817040).

990012143800 is an abundant number, since it is smaller than the sum of its proper divisors (1326801490280).

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

990012143800 is a wasteful number, since it uses less digits than its factorization.

990012143800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34673 (or 34664 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 37.

Adding to 990012143800 its reverse (8341210099), we get a palindrome (998353353899).

The spelling of 990012143800 in words is "nine hundred ninety billion, twelve million, one hundred forty-three thousand, eight hundred".