43689985 has 8 divisors (see below), whose sum is σ = 52811496. Its totient is φ = 34696320.

The previous prime is 43689977. The next prime is 43689991. The reversal of 43689985 is 58998634.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5793649 + 37896336 = 2407^2 + 6156^2 .

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

It is not a de Polignac number, because 43689985 - 2³ = 43689977 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31206 + ... + 32575.

It is an arithmetic number, because the mean of its divisors is an integer number (6601437).

Almost surely, 2^43689985 is an apocalyptic number.

It is an amenable number.

43689985 is a deficient number, since it is larger than the sum of its proper divisors (9121511).

43689985 is a wasteful number, since it uses less digits than its factorization.

43689985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63923.

The product of its digits is 1866240, while the sum is 52.

The square root of 43689985 is about 6609.8400131925. The cubic root of 43689985 is about 352.2037414890.

The spelling of 43689985 in words is "forty-three million, six hundred eighty-nine thousand, nine hundred eighty-five".