40399920000 has 480 divisors, whose sum is σ = 158509854360. Its totient is φ = 9792000000.

The previous prime is 40399919971. The next prime is 40399920017. The reversal of 40399920000 is 2999304.

It is a tau number, because it is divible by the number of its divisors (480).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 7917450 + ... + 7922550.

Almost surely, 2^40399920000 is an apocalyptic number.

40399920000 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40399920000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79254927180).

40399920000 is an abundant number, since it is smaller than the sum of its proper divisors (118109934360).

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

40399920000 is a wasteful number, since it uses less digits than its factorization.

40399920000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5152 (or 5122 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The spelling of 40399920000 in words is "forty billion, three hundred ninety-nine million, nine hundred twenty thousand".