43844590881 has 135 divisors (see below), whose sum is σ = 81185502021. Its totient is φ = 22734837216.

The previous prime is 43844590837. The next prime is 43844590913. The reversal of 43844590881 is 18809544834.

It is a happy number.

The square root of 43844590881 is 209391.

It is a perfect power (a square), and thus also a powerful number.

43844590881 is a `hidden beast` number, since 4 + 3 + 8 + 44 + 590 + 8 + 8 + 1 = 666.

43844590881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 21738848481 + 22105742400 = 147441^2 + 148680^2 .

It is not a de Polignac number, because 43844590881 - 2⁷ = 43844590753 is a prime.

It is a super-2 number, since 2×43844590881² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (43844590981) by changing a digit.

It is a polite number, since it can be written in 134 ways as a sum of consecutive naturals, for example, 743128630 + ... + 743128688.

Almost surely, 2^43844590881 is an apocalyptic number.

43844590881 is the 209391-st square number.

43844590881 is the 104696-th centered octagonal number.

It is an amenable number.

43844590881 is a deficient number, since it is larger than the sum of its proper divisors (37340911140).

43844590881 is an frugal number, since it uses more digits than its factorization.

43844590881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190 (or 82 counting only the distinct ones).

The product of its (nonzero) digits is 4423680, while the sum is 54.

The spelling of 43844590881 in words is "forty-three billion, eight hundred forty-four million, five hundred ninety thousand, eight hundred eighty-one".