43121794640 has 40 divisors (see below), whose sum is σ = 100688508648. Its totient is φ = 17174681600.

The previous prime is 43121794609. The next prime is 43121794657. The reversal of 43121794640 is 4649712134.

It can be written as a sum of positive squares in 4 ways, for example, as 2230483984 + 40891310656 = 47228^2 + 202216^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1138061 + ... + 1175340.

Almost surely, 2^43121794640 is an apocalyptic number.

43121794640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

43121794640 is an abundant number, since it is smaller than the sum of its proper divisors (57566714008).

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

43121794640 is a wasteful number, since it uses less digits than its factorization.

43121794640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2313647 (or 2313641 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 41.

The spelling of 43121794640 in words is "forty-three billion, one hundred twenty-one million, seven hundred ninety-four thousand, six hundred forty".