43091947 has 4 divisors (see below), whose sum is σ = 43366576. Its totient is φ = 42817320.

The previous prime is 43091933. The next prime is 43091963. The reversal of 43091947 is 74919034.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 43091947 - 2⁷ = 43091819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43091987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137079 + ... + 137392.

It is an arithmetic number, because the mean of its divisors is an integer number (10841644).

Almost surely, 2^43091947 is an apocalyptic number.

43091947 is a deficient number, since it is larger than the sum of its proper divisors (274629).

43091947 is a wasteful number, since it uses less digits than its factorization.

43091947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274628.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 43091947 is about 6564.4456734746. The cubic root of 43091947 is about 350.5893390714.

The spelling of 43091947 in words is "forty-three million, ninety-one thousand, nine hundred forty-seven".