8440669 has 2 divisors, whose sum is σ = 8440670. Its totient is φ = 8440668.

The previous prime is 8440667. The next prime is 8440673. The reversal of 8440669 is 9660448.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6827769 + 1612900 = 2613^2 + 1270^2 .

It is a cyclic number.

It is not a de Polignac number, because 8440669 - 2¹ = 8440667 is a prime.

It is a super-2 number, since 2×8440669² = 142489786335122, which contains 22 as substring.

Together with 8440667, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8440667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4220334 + 4220335.

It is an arithmetic number, because the mean of its divisors is an integer number (4220335).

Almost surely, 2^8440669 is an apocalyptic number.

It is an amenable number.

8440669 is a deficient number, since it is larger than the sum of its proper divisors (1).

8440669 is an equidigital number, since it uses as much as digits as its factorization.

8440669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 8440669 is about 2905.2829466336. The cubic root of 8440669 is about 203.6068054305.

The spelling of 8440669 in words is "eight million, four hundred forty thousand, six hundred sixty-nine".