43638861 has 16 divisors (see below), whose sum is σ = 67856000. Its totient is φ = 24935904.

The previous prime is 43638853. The next prime is 43638863. The reversal of 43638861 is 16883634.

It is not a de Polignac number, because 43638861 - 2³ = 43638853 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 (43638863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20176 + ... + 22233.

It is an arithmetic number, because the mean of its divisors is an integer number (4241000).

Almost surely, 2^43638861 is an apocalyptic number.

It is an amenable number.

43638861 is a deficient number, since it is larger than the sum of its proper divisors (24217139).

43638861 is an equidigital number, since it uses as much as digits as its factorization.

43638861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42433 (or 42419 counting only the distinct ones).

The product of its digits is 82944, while the sum is 39.

The square root of 43638861 is about 6605.9716166511. The cubic root of 43638861 is about 352.0663103597.

The spelling of 43638861 in words is "forty-three million, six hundred thirty-eight thousand, eight hundred sixty-one".