869849 has 2 divisors, whose sum is σ = 869850. Its totient is φ = 869848.

The previous prime is 869819. The next prime is 869863. The reversal of 869849 is 948968.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 868624 + 1225 = 932^2 + 35^2 .

It is a cyclic number.

It is not a de Polignac number, because 869849 - 2¹⁶ = 804313 is a prime.

It is a Chen prime.

It is a plaindrome in base 15.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 869849.

It is not a weakly prime, because it can be changed into another prime (869809) 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, 434924 + 434925.

It is an arithmetic number, because the mean of its divisors is an integer number (434925).

2⁸⁶⁹⁸⁴⁹ is an apocalyptic number.

It is an amenable number.

869849 is a deficient number, since it is larger than the sum of its proper divisors (1).

869849 is an equidigital number, since it uses as much as digits as its factorization.

869849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 44.

The square root of 869849 is about 932.6569572999. The cubic root of 869849 is about 95.4585037594.

The spelling of 869849 in words is "eight hundred sixty-nine thousand, eight hundred forty-nine".