84429809 has 2 divisors, whose sum is σ = 84429810. Its totient is φ = 84429808.

The previous prime is 84429791. The next prime is 84429823. The reversal of 84429809 is 90892448.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54760000 + 29669809 = 7400^2 + 5447^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84429809 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 84429809.

It is not a weakly prime, because it can be changed into another prime (84429899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42214904 + 42214905.

It is an arithmetic number, because the mean of its divisors is an integer number (42214905).

Almost surely, 2^84429809 is an apocalyptic number.

It is an amenable number.

84429809 is a deficient number, since it is larger than the sum of its proper divisors (1).

84429809 is an equidigital number, since it uses as much as digits as its factorization.

84429809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 165888, while the sum is 44.

The square root of 84429809 is about 9188.5694751686. The cubic root of 84429809 is about 438.6976105389.

The spelling of 84429809 in words is "eighty-four million, four hundred twenty-nine thousand, eight hundred nine".