869909 has 2 divisors, whose sum is σ = 869910. Its totient is φ = 869908.

The previous prime is 869899. The next prime is 869927. The reversal of 869909 is 909968.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 483025 + 386884 = 695^2 + 622^2 .

It is a cyclic number.

It is not a de Polignac number, because 869909 - 2⁴ = 869893 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 869909.

It is not a weakly prime, because it can be changed into another prime (869959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434954 + 434955.

It is an arithmetic number, because the mean of its divisors is an integer number (434955).

2⁸⁶⁹⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

869909 is a deficient number, since it is larger than the sum of its proper divisors (1).

869909 is an equidigital number, since it uses as much as digits as its factorization.

869909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 869909 is about 932.6891229129. The cubic root of 869909 is about 95.4606985383.

The spelling of 869909 in words is "eight hundred sixty-nine thousand, nine hundred nine".