43085991 has 8 divisors (see below), whose sum is σ = 61867120. Its totient is φ = 26514432.

The previous prime is 43085983. The next prime is 43086023. The reversal of 43085991 is 19958034.

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

It is not a de Polignac number, because 43085991 - 2³ = 43085983 is a prime.

It is a super-3 number, since 3×43085991³ (a number of 24 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 1104769 = 43085991 / (4 + 3 + 0 + 8 + 5 + 9 + 9 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43085921) 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, 552346 + ... + 552423.

It is an arithmetic number, because the mean of its divisors is an integer number (7733390).

Almost surely, 2^43085991 is an apocalyptic number.

43085991 is a deficient number, since it is larger than the sum of its proper divisors (18781129).

43085991 is a wasteful number, since it uses less digits than its factorization.

43085991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1104785.

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 43085991 is about 6563.9920018233. The cubic root of 43085991 is about 350.5731859658.

The spelling of 43085991 in words is "forty-three million, eighty-five thousand, nine hundred ninety-one".