43215697 has 6 divisors (see below), whose sum is σ = 50271378. Its totient is φ = 37041984.

The previous prime is 43215673. The next prime is 43215707. The reversal of 43215697 is 79651234.

43215697 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 24561936 + 18653761 = 4956^2 + 4319^2 .

It is not a de Polignac number, because 43215697 - 2¹⁵ = 43182929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43215637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 440928 + ... + 441025.

It is an arithmetic number, because the mean of its divisors is an integer number (8378563).

Almost surely, 2^43215697 is an apocalyptic number.

It is an amenable number.

43215697 is a deficient number, since it is larger than the sum of its proper divisors (7055681).

43215697 is an equidigital number, since it uses as much as digits as its factorization.

43215697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 881967 (or 881960 counting only the distinct ones).

The product of its digits is 45360, while the sum is 37.

The square root of 43215697 is about 6573.8646928576. The cubic root of 43215697 is about 350.9246218711.

It can be divided in two parts, 432 and 15697, that added together give a square (16129 = 127²).

The spelling of 43215697 in words is "forty-three million, two hundred fifteen thousand, six hundred ninety-seven".