43991316 has 48 divisors (see below), whose sum is σ = 115678080. Its totient is φ = 14454720.

The previous prime is 43991273. The next prime is 43991317. The reversal of 43991316 is 61319934.

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

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43991317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4800 + ... + 10536.

It is an arithmetic number, because the mean of its divisors is an integer number (2409960).

Almost surely, 2^43991316 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 43991316, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57839040).

43991316 is an abundant number, since it is smaller than the sum of its proper divisors (71686764).

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

43991316 is a wasteful number, since it uses less digits than its factorization.

43991316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5821 (or 5813 counting only the distinct ones).

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

The square root of 43991316 is about 6632.5949672809. The cubic root of 43991316 is about 353.0116065917.

The spelling of 43991316 in words is "forty-three million, nine hundred ninety-one thousand, three hundred sixteen".