43609999940 has 24 divisors (see below), whose sum is σ = 98625692760. Its totient is φ = 16102153728.

The previous prime is 43609999913. The next prime is 43609999943. The reversal of 43609999940 is 4999990634.

It can be written as a sum of positive squares in 4 ways, for example, as 2845582336 + 40764417604 = 53344^2 + 201902^2 .

It is not an unprimeable number, because it can be changed into a prime (43609999943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83865125 + ... + 83865644.

It is an arithmetic number, because the mean of its divisors is an integer number (4109403865).

Almost surely, 2^43609999940 is an apocalyptic number.

It is an amenable number.

43609999940 is an abundant number, since it is smaller than the sum of its proper divisors (55015692820).

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

43609999940 is a wasteful number, since it uses less digits than its factorization.

43609999940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167730791 (or 167730789 counting only the distinct ones).

The product of its (nonzero) digits is 17006112, while the sum is 62.

The spelling of 43609999940 in words is "forty-three billion, six hundred nine million, nine hundred ninety-nine thousand, nine hundred forty".