40389208992 has 144 divisors (see below), whose sum is σ = 125373280032. Its totient is φ = 12231836160.

The previous prime is 40389208961. The next prime is 40389208997. The reversal of 40389208992 is 29980298304.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (144).

It is not an unprimeable number, because it can be changed into a prime (40389208997) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 7844563 + ... + 7849709.

It is an arithmetic number, because the mean of its divisors is an integer number (870647778).

Almost surely, 2^40389208992 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 40389208992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62686640016).

40389208992 is an abundant number, since it is smaller than the sum of its proper divisors (84984071040).

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

40389208992 is a wasteful number, since it uses less digits than its factorization.

40389208992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7651 (or 7640 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 54.

The spelling of 40389208992 in words is "forty billion, three hundred eighty-nine million, two hundred eight thousand, nine hundred ninety-two".