43636989 has 8 divisors (see below), whose sum is σ = 63472032. Its totient is φ = 26446640.

The previous prime is 43636987. The next prime is 43637047. The reversal of 43636989 is 98963634.

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

It is not a de Polignac number, because 43636989 - 2¹ = 43636987 is a prime.

It is a super-2 number, since 2×43636989² = 3808373617972242, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43636981) 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, 661134 + ... + 661199.

It is an arithmetic number, because the mean of its divisors is an integer number (7934004).

Almost surely, 2^43636989 is an apocalyptic number.

It is an amenable number.

43636989 is a deficient number, since it is larger than the sum of its proper divisors (19835043).

43636989 is a wasteful number, since it uses less digits than its factorization.

43636989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1322347.

The product of its digits is 839808, while the sum is 48.

The square root of 43636989 is about 6605.8299251495. The cubic root of 43636989 is about 352.0612760275.

The spelling of 43636989 in words is "forty-three million, six hundred thirty-six thousand, nine hundred eighty-nine".