42448309 has 2 divisors, whose sum is σ = 42448310. Its totient is φ = 42448308.

The previous prime is 42448279. The next prime is 42448313. The reversal of 42448309 is 90384424.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39967684 + 2480625 = 6322^2 + 1575^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42448309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42448339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21224154 + 21224155.

It is an arithmetic number, because the mean of its divisors is an integer number (21224155).

Almost surely, 2^42448309 is an apocalyptic number.

It is an amenable number.

42448309 is a deficient number, since it is larger than the sum of its proper divisors (1).

42448309 is an equidigital number, since it uses as much as digits as its factorization.

42448309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 42448309 is about 6515.2366802749. The cubic root of 42448309 is about 348.8350629898.

The spelling of 42448309 in words is "forty-two million, four hundred forty-eight thousand, three hundred nine".