8420449 has 2 divisors, whose sum is σ = 8420450. Its totient is φ = 8420448.

The previous prime is 8420443. The next prime is 8420453. The reversal of 8420449 is 9440248.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5382400 + 3038049 = 2320^2 + 1743^2 .

It is a cyclic number.

It is not a de Polignac number, because 8420449 - 2³ = 8420441 is a prime.

It is a super-2 number, since 2×8420449² = 141807922723202, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 8420449.

It is not a weakly prime, because it can be changed into another prime (8420441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4210224 + 4210225.

It is an arithmetic number, because the mean of its divisors is an integer number (4210225).

Almost surely, 2^8420449 is an apocalyptic number.

It is an amenable number.

8420449 is a deficient number, since it is larger than the sum of its proper divisors (1).

8420449 is an equidigital number, since it uses as much as digits as its factorization.

8420449 is an odious number, because the sum of its binary digits is odd.

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

The square root of 8420449 is about 2901.8009924873. The cubic root of 8420449 is about 203.4440923636. Note that the first 3 decimals are identical.

The spelling of 8420449 in words is "eight million, four hundred twenty thousand, four hundred forty-nine".