43943640 has 128 divisors (see below), whose sum is σ = 150413760. Its totient is φ = 10174464.

The previous prime is 43943633. The next prime is 43943687. The reversal of 43943640 is 4634934.

43943640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 6629²-1.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 25692 + ... + 27348.

Almost surely, 2^43943640 is an apocalyptic number.

43943640 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 43943640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75206880).

43943640 is an abundant number, since it is smaller than the sum of its proper divisors (106470120).

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

43943640 is a wasteful number, since it uses less digits than its factorization.

43943640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1701 (or 1697 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 33.

The square root of 43943640 is about 6628.9999245738. Note that the first 4 decimals coincide. The cubic root of 43943640 is about 352.8840339515.

The spelling of 43943640 in words is "forty-three million, nine hundred forty-three thousand, six hundred forty".