999400090000 has 225 divisors, whose sum is σ = 2623503306303. Its totient is φ = 368529408000.

The previous prime is 999400089959. The next prime is 999400090027. The reversal of 999400090000 is 90004999.

The square root of 999400090000 is 999700.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 22 ways, for example, as 501054453904 + 498345636096 = 707852^2 + 705936^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a Duffinian number.

It is an unprimeable number.

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 44 ways as a sum of consecutive naturals, for example, 1299609616 + ... + 1299610384.

Almost surely, 2^999400090000 is an apocalyptic number.

999400090000 is the 999700-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999400090000

999400090000 is an abundant number, since it is smaller than the sum of its proper divisors (1624103216303).

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

999400090000 is an frugal number, since it uses more digits than its factorization.

999400090000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1592 (or 789 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 40.

Adding to 999400090000 its reverse (90004999), we get a palindrome (999490094999).

The spelling of 999400090000 in words is "nine hundred ninety-nine billion, four hundred million, ninety thousand".