43999660 has 36 divisors (see below), whose sum is σ = 95023152. Its totient is φ = 17113536.

The previous prime is 43999651. The next prime is 43999673. The reversal of 43999660 is 6699934.

It is a self number, because there is not a number n which added to its sum of digits gives 43999660.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26577 + ... + 28183.

It is an arithmetic number, because the mean of its divisors is an integer number (2639532).

Almost surely, 2^43999660 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 43999660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47511576).

43999660 is an abundant number, since it is smaller than the sum of its proper divisors (51023492).

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

43999660 is a wasteful number, since it uses less digits than its factorization.

43999660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1690 (or 1651 counting only the distinct ones).

The product of its (nonzero) digits is 314928, while the sum is 46.

The square root of 43999660 is about 6633.2239521970. The cubic root of 43999660 is about 353.0339241981.

The spelling of 43999660 in words is "forty-three million, nine hundred ninety-nine thousand, six hundred sixty".