43408139 has 2 divisors, whose sum is σ = 43408140. Its totient is φ = 43408138.

The previous prime is 43408111. The next prime is 43408147. The reversal of 43408139 is 93180434.

43408139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43408139 is a prime.

It is equal to p_2627744 and since 43408139 and 2627744 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (43408109) 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, 21704069 + 21704070.

It is an arithmetic number, because the mean of its divisors is an integer number (21704070).

Almost surely, 2^43408139 is an apocalyptic number.

43408139 is a deficient number, since it is larger than the sum of its proper divisors (1).

43408139 is an equidigital number, since it uses as much as digits as its factorization.

43408139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 43408139 is about 6588.4853342783. The cubic root of 43408139 is about 351.4447464692. Note that the first 3 decimals are identical.

The spelling of 43408139 in words is "forty-three million, four hundred eight thousand, one hundred thirty-nine".