43985861812 has 48 divisors (see below), whose sum is σ = 83947525200. Its totient is φ = 20081682432.

The previous prime is 43985861789. The next prime is 43985861831. The reversal of 43985861812 is 21816858934.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 1777802896 + 42208058916 = 42164^2 + 205446^2 .

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 853038 + ... + 903130.

It is an arithmetic number, because the mean of its divisors is an integer number (1748906775).

Almost surely, 2^43985861812 is an apocalyptic number.

It is an amenable number.

43985861812 is a deficient number, since it is larger than the sum of its proper divisors (39961663388).

43985861812 is a wasteful number, since it uses less digits than its factorization.

43985861812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50500 (or 50498 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 55.

The spelling of 43985861812 in words is "forty-three billion, nine hundred eighty-five million, eight hundred sixty-one thousand, eight hundred twelve".