43321945 has 4 divisors (see below), whose sum is σ = 51986340. Its totient is φ = 34657552.

The previous prime is 43321913. The next prime is 43321963. The reversal of 43321945 is 54912334.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54912334 = 2 ⋅27456167.

It can be written as a sum of positive squares in 2 ways, for example, as 33512521 + 9809424 = 5789^2 + 3132^2 .

It is a cyclic number.

It is not a de Polignac number, because 43321945 - 2⁵ = 43321913 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4332190 + ... + 4332199.

It is an arithmetic number, because the mean of its divisors is an integer number (12996585).

Almost surely, 2^43321945 is an apocalyptic number.

It is an amenable number.

43321945 is a deficient number, since it is larger than the sum of its proper divisors (8664395).

43321945 is an equidigital number, since it uses as much as digits as its factorization.

43321945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8664394.

The product of its digits is 12960, while the sum is 31.

The square root of 43321945 is about 6581.9408231919. The cubic root of 43321945 is about 351.2119752153.

The spelling of 43321945 in words is "forty-three million, three hundred twenty-one thousand, nine hundred forty-five".