43439985 has 72 divisors (see below), whose sum is σ = 84502080. Its totient is φ = 20547648.

The previous prime is 43439983. The next prime is 43439987. The reversal of 43439985 is 58993434.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (43439983) and next prime (43439987).

It is not a de Polignac number, because 43439985 - 2¹ = 43439983 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 43439985.

It is not an unprimeable number, because it can be changed into a prime (43439983) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 924232 + ... + 924278.

It is an arithmetic number, because the mean of its divisors is an integer number (1173640).

Almost surely, 2^43439985 is an apocalyptic number.

43439985 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

43439985 is a deficient number, since it is larger than the sum of its proper divisors (41062095).

43439985 is a wasteful number, since it uses less digits than its factorization.

43439985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147 (or 97 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The square root of 43439985 is about 6590.9016833814. The cubic root of 43439985 is about 351.5306702442.

The spelling of 43439985 in words is "forty-three million, four hundred thirty-nine thousand, nine hundred eighty-five".