43638789 has 4 divisors (see below), whose sum is σ = 58185056. Its totient is φ = 29092524.

The previous prime is 43638787. The next prime is 43638817. The reversal of 43638789 is 98783634.

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 not a de Polignac number, because 43638789 - 2¹ = 43638787 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43638781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7273129 + ... + 7273134.

It is an arithmetic number, because the mean of its divisors is an integer number (14546264).

Almost surely, 2^43638789 is an apocalyptic number.

It is an amenable number.

43638789 is a deficient number, since it is larger than the sum of its proper divisors (14546267).

43638789 is a wasteful number, since it uses less digits than its factorization.

43638789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14546266.

The product of its digits is 870912, while the sum is 48.

The square root of 43638789 is about 6605.9661670342. The cubic root of 43638789 is about 352.0661167342.

The spelling of 43638789 in words is "forty-three million, six hundred thirty-eight thousand, seven hundred eighty-nine".