43340721840 has 480 divisors, whose sum is σ = 163368668736. Its totient is φ = 10615173120.

The previous prime is 43340721839. The next prime is 43340721869. The reversal of 43340721840 is 4812704334.

43340721840 is a `hidden beast` number, since 4 + 33 + 407 + 218 + 4 + 0 = 666.

It is a super-2 number, since 2×43340721840² (a number of 22 digits) contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 43340721795 and 43340721804.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 80111970 + ... + 80112510.

Almost surely, 2^43340721840 is an apocalyptic number.

43340721840 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 43340721840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81684334368).

43340721840 is an abundant number, since it is smaller than the sum of its proper divisors (120027946896).

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

43340721840 is a wasteful number, since it uses less digits than its factorization.

43340721840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 899 (or 881 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 36.

The spelling of 43340721840 in words is "forty-three billion, three hundred forty million, seven hundred twenty-one thousand, eight hundred forty".