994403891040 has 576 divisors, whose sum is σ = 3788610029568. Its totient is φ = 218424729600.

The previous prime is 994403890981. The next prime is 994403891071. The reversal of 994403891040 is 40198304499.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 64601745 + ... + 64617135.

It is an arithmetic number, because the mean of its divisors is an integer number (6577447968).

Almost surely, 2^994403891040 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 994403891040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1894305014784).

994403891040 is an abundant number, since it is smaller than the sum of its proper divisors (2794206138528).

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

994403891040 is a wasteful number, since it uses less digits than its factorization.

994403891040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15531 (or 15516 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 51.

The spelling of 994403891040 in words is "nine hundred ninety-four billion, four hundred three million, eight hundred ninety-one thousand, forty".