8440429 has 2 divisors, whose sum is σ = 8440430. Its totient is φ = 8440428.

The previous prime is 8440423. The next prime is 8440441. The reversal of 8440429 is 9240448.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8398404 + 42025 = 2898^2 + 205^2 .

It is a cyclic number.

It is not a de Polignac number, because 8440429 - 2²¹ = 6343277 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 8440429.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8440423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4220214 + 4220215.

It is an arithmetic number, because the mean of its divisors is an integer number (4220215).

Almost surely, 2^8440429 is an apocalyptic number.

It is an amenable number.

8440429 is a deficient number, since it is larger than the sum of its proper divisors (1).

8440429 is an equidigital number, since it uses as much as digits as its factorization.

8440429 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 8440429 is about 2905.2416422735. The cubic root of 8440429 is about 203.6048756428.

The spelling of 8440429 in words is "eight million, four hundred forty thousand, four hundred twenty-nine".