43955989 has 12 divisors (see below), whose sum is σ = 55781568. Its totient is φ = 34251000.

The previous prime is 43955981. The next prime is 43955993. The reversal of 43955989 is 98955934.

It is not a de Polignac number, because 43955989 - 2³ = 43955981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43955981) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40237 + ... + 41314.

It is an arithmetic number, because the mean of its divisors is an integer number (4648464).

Almost surely, 2^43955989 is an apocalyptic number.

43955989 is a gapful number since it is divisible by the number (49) formed by its first and last digit.

It is an amenable number.

43955989 is a deficient number, since it is larger than the sum of its proper divisors (11825579).

43955989 is a wasteful number, since it uses less digits than its factorization.

43955989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81576 (or 81569 counting only the distinct ones).

The product of its digits is 1749600, while the sum is 52.

The square root of 43955989 is about 6629.9312967783. The cubic root of 43955989 is about 352.9170865677.

Subtracting 43955989 from its reverse (98955934), we obtain a palindrome (54999945).

It can be divided in two parts, 43955 and 989, that added together give a palindrome (44944).

The spelling of 43955989 in words is "forty-three million, nine hundred fifty-five thousand, nine hundred eighty-nine".