43718989 has 4 divisors (see below), whose sum is σ = 43926400. Its totient is φ = 43511580.

The previous prime is 43718971. The next prime is 43718993. The reversal of 43718989 is 98981734.

It is a happy number.

43718989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43718989 is a prime.

It is a super-2 number, since 2×43718989² = 3822699998364242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43715989) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 103389 + ... + 103810.

It is an arithmetic number, because the mean of its divisors is an integer number (10981600).

Almost surely, 2^43718989 is an apocalyptic number.

It is an amenable number.

43718989 is a deficient number, since it is larger than the sum of its proper divisors (207411).

43718989 is a wasteful number, since it uses less digits than its factorization.

43718989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207410.

The product of its digits is 435456, while the sum is 49.

The square root of 43718989 is about 6612.0336508521. The cubic root of 43718989 is about 352.2816621508.

The spelling of 43718989 in words is "forty-three million, seven hundred eighteen thousand, nine hundred eighty-nine".