43621429 has 2 divisors, whose sum is σ = 43621430. Its totient is φ = 43621428.

The previous prime is 43621399. The next prime is 43621447. The reversal of 43621429 is 92412634.

It is a happy number.

43621429 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 can be written as a sum of positive squares in only one way, i.e., 41667025 + 1954404 = 6455^2 + 1398^2 .

It is a cyclic number.

It is not a de Polignac number, because 43621429 - 2⁷ = 43621301 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 43621429.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43622429) 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, 21810714 + 21810715.

It is an arithmetic number, because the mean of its divisors is an integer number (21810715).

Almost surely, 2^43621429 is an apocalyptic number.

It is an amenable number.

43621429 is a deficient number, since it is larger than the sum of its proper divisors (1).

43621429 is an equidigital number, since it uses as much as digits as its factorization.

43621429 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 31.

The square root of 43621429 is about 6604.6520725925. The cubic root of 43621429 is about 352.0194252581.

The spelling of 43621429 in words is "forty-three million, six hundred twenty-one thousand, four hundred twenty-nine".