43991067 has 4 divisors (see below), whose sum is σ = 58654760. Its totient is φ = 29327376.

The previous prime is 43991047. The next prime is 43991081. The reversal of 43991067 is 76019934.

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

It is a de Polignac number, because none of the positive numbers 2^k-43991067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43991027) 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, 7331842 + ... + 7331847.

It is an arithmetic number, because the mean of its divisors is an integer number (14663690).

Almost surely, 2^43991067 is an apocalyptic number.

43991067 is a deficient number, since it is larger than the sum of its proper divisors (14663693).

43991067 is a wasteful number, since it uses less digits than its factorization.

43991067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14663692.

The product of its (nonzero) digits is 40824, while the sum is 39.

The square root of 43991067 is about 6632.5761963207. The cubic root of 43991067 is about 353.0109405507.

The spelling of 43991067 in words is "forty-three million, nine hundred ninety-one thousand, sixty-seven".