43243139 has 2 divisors, whose sum is σ = 43243140. Its totient is φ = 43243138.

The previous prime is 43243133. The next prime is 43243157. The reversal of 43243139 is 93134234.

43243139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 43243139 - 2²⁰ = 42194563 is a prime.

It is a super-3 number, since 3×43243139³ (a number of 24 digits) contains 333 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (43243133) 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 as a sum of consecutive naturals, namely, 21621569 + 21621570.

It is an arithmetic number, because the mean of its divisors is an integer number (21621570).

Almost surely, 2^43243139 is an apocalyptic number.

43243139 is a deficient number, since it is larger than the sum of its proper divisors (1).

43243139 is an equidigital number, since it uses as much as digits as its factorization.

43243139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 29.

The square root of 43243139 is about 6575.9515661233. The cubic root of 43243139 is about 350.9988852869.

The spelling of 43243139 in words is "forty-three million, two hundred forty-three thousand, one hundred thirty-nine".