43197891 has 32 divisors (see below), whose sum is σ = 64696320. Its totient is φ = 25418400.

The previous prime is 43197877. The next prime is 43197893. The reversal of 43197891 is 19879134.

It is a happy number.

It is not a de Polignac number, because 43197891 - 2⁵ = 43197859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (43197893) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 241240 + ... + 241418.

It is an arithmetic number, because the mean of its divisors is an integer number (2021760).

Almost surely, 2^43197891 is an apocalyptic number.

43197891 is a deficient number, since it is larger than the sum of its proper divisors (21498429).

43197891 is a wasteful number, since it uses less digits than its factorization.

43197891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367.

The product of its digits is 54432, while the sum is 42.

The square root of 43197891 is about 6572.5102510380. The cubic root of 43197891 is about 350.8764185358.

The spelling of 43197891 in words is "forty-three million, one hundred ninety-seven thousand, eight hundred ninety-one".