43391871 has 12 divisors (see below), whose sum is σ = 66364272. Its totient is φ = 27226176.

The previous prime is 43391867. The next prime is 43391879. The reversal of 43391871 is 17819334.

It is a happy number.

It is not a de Polignac number, because 43391871 - 2² = 43391867 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43391879) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 141651 + ... + 141956.

It is an arithmetic number, because the mean of its divisors is an integer number (5530356).

Almost surely, 2^43391871 is an apocalyptic number.

43391871 is a deficient number, since it is larger than the sum of its proper divisors (22972401).

43391871 is a wasteful number, since it uses less digits than its factorization.

43391871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283630 (or 283627 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 43391871 is about 6587.2506404417. The cubic root of 43391871 is about 351.4008375185.

The spelling of 43391871 in words is "forty-three million, three hundred ninety-one thousand, eight hundred seventy-one".