8420669 has 2 divisors, whose sum is σ = 8420670. Its totient is φ = 8420668.

The previous prime is 8420653. The next prime is 8420677. The reversal of 8420669 is 9660248.

8420669 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., 8048569 + 372100 = 2837^2 + 610^2 .

It is a cyclic number.

It is not a de Polignac number, because 8420669 - 2⁴ = 8420653 is a prime.

It is a super-2 number, since 2×8420669² = 141815332815122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8420569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4210334 + 4210335.

It is an arithmetic number, because the mean of its divisors is an integer number (4210335).

Almost surely, 2^8420669 is an apocalyptic number.

It is an amenable number.

8420669 is a deficient number, since it is larger than the sum of its proper divisors (1).

8420669 is an equidigital number, since it uses as much as digits as its factorization.

8420669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 8420669 is about 2901.8388997324. The cubic root of 8420669 is about 203.4458641342.

The spelling of 8420669 in words is "eight million, four hundred twenty thousand, six hundred sixty-nine".