43538989 has 8 divisors (see below), whose sum is σ = 49646520. Its totient is φ = 37825536.

The previous prime is 43538987. The next prime is 43539017. The reversal of 43538989 is 98983534.

It can be written as a sum of positive squares in 4 ways, for example, as 8076964 + 35462025 = 2842^2 + 5955^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 43538989 - 2¹ = 43538987 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 (43538987) 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, 98284 + ... + 98725.

It is an arithmetic number, because the mean of its divisors is an integer number (6205815).

Almost surely, 2^43538989 is an apocalyptic number.

It is an amenable number.

43538989 is a deficient number, since it is larger than the sum of its proper divisors (6107531).

43538989 is a wasteful number, since it uses less digits than its factorization.

43538989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197039.

The product of its digits is 933120, while the sum is 49.

The square root of 43538989 is about 6598.4080655867. The cubic root of 43538989 is about 351.7975252790.

The spelling of 43538989 in words is "forty-three million, five hundred thirty-eight thousand, nine hundred eighty-nine".