999400080 has 240 divisors, whose sum is σ = 3816720000. Its totient is φ = 214953984.

The previous prime is 999400069. The next prime is 999400147. The reversal of 999400080 is 80004999.

It is a tau number, because it is divible by the number of its divisors (240).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 197421 + ... + 202419.

It is an arithmetic number, because the mean of its divisors is an integer number (15903000).

Almost surely, 2^999400080 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 999400080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1908360000).

999400080 is an abundant number, since it is smaller than the sum of its proper divisors (2817319920).

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

999400080 is a wasteful number, since it uses less digits than its factorization.

999400080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5046 (or 5033 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 999400080 is about 31613.2896105420. The cubic root of 999400080 is about 999.7999866640.

The spelling of 999400080 in words is "nine hundred ninety-nine million, four hundred thousand, eighty".