43421429 has 2 divisors, whose sum is σ = 43421430. Its totient is φ = 43421428.

The previous prime is 43421393. The next prime is 43421437. The reversal of 43421429 is 92412434.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23261329 + 20160100 = 4823^2 + 4490^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43421429 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43421449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21710714 + 21710715.

It is an arithmetic number, because the mean of its divisors is an integer number (21710715).

Almost surely, 2^43421429 is an apocalyptic number.

It is an amenable number.

43421429 is a deficient number, since it is larger than the sum of its proper divisors (1).

43421429 is an equidigital number, since it uses as much as digits as its factorization.

43421429 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 29.

The square root of 43421429 is about 6589.4938348860. The cubic root of 43421429 is about 351.4806093603.

The spelling of 43421429 in words is "forty-three million, four hundred twenty-one thousand, four hundred twenty-nine".