43506640 has 80 divisors (see below), whose sum is σ = 106707456. Its totient is φ = 16473600.

The previous prime is 43506629. The next prime is 43506647. The reversal of 43506640 is 4660534.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 43506599 and 43506608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43506647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 131275 + ... + 131605.

Almost surely, 2^43506640 is an apocalyptic number.

43506640 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 43506640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53353728).

43506640 is an abundant number, since it is smaller than the sum of its proper divisors (63200816).

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

43506640 is a wasteful number, since it uses less digits than its factorization.

43506640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428 (or 422 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 43506640 is about 6595.9563370295. The cubic root of 43506640 is about 351.7103764342.

The spelling of 43506640 in words is "forty-three million, five hundred six thousand, six hundred forty".