869969 has 4 divisors (see below), whose sum is σ = 871920. Its totient is φ = 868020.

The previous prime is 869959. The next prime is 869983. The reversal of 869969 is 969968.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-869969 is a prime.

It is a super-2 number, since 2×869969² = 1513692121922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (869909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62 + ... + 1320.

It is an arithmetic number, because the mean of its divisors is an integer number (217980).

2⁸⁶⁹⁹⁶⁹ is an apocalyptic number.

It is an amenable number.

869969 is a deficient number, since it is larger than the sum of its proper divisors (1951).

869969 is a wasteful number, since it uses less digits than its factorization.

869969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1950.

The product of its digits is 209952, while the sum is 47.

The square root of 869969 is about 932.7212874166. The cubic root of 869969 is about 95.4628932162.

Subtracting 869969 from its reverse (969968), we obtain a palindrome (99999).

The spelling of 869969 in words is "eight hundred sixty-nine thousand, nine hundred sixty-nine".