43605989 has 8 divisors (see below), whose sum is σ = 50896128. Its totient is φ = 36581040.

The previous prime is 43605971. The next prime is 43605997. The reversal of 43605989 is 98950634.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 43605989 - 2¹² = 43601893 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 (43605929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65942 + ... + 66599.

It is an arithmetic number, because the mean of its divisors is an integer number (6362016).

Almost surely, 2^43605989 is an apocalyptic number.

It is an amenable number.

43605989 is a deficient number, since it is larger than the sum of its proper divisors (7290139).

43605989 is a wasteful number, since it uses less digits than its factorization.

43605989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132595.

The product of its (nonzero) digits is 233280, while the sum is 44.

The square root of 43605989 is about 6603.4830960638. The cubic root of 43605989 is about 351.9778874065.

The spelling of 43605989 in words is "forty-three million, six hundred five thousand, nine hundred eighty-nine".