869869 has 24 divisors (see below), whose sum is σ = 1191680. Its totient is φ = 617760.

The previous prime is 869863. The next prime is 869879. The reversal of 869869 is 968968.

It is a happy number.

It is not a de Polignac number, because 869869 - 2¹⁷ = 738797 is a prime.

It is a super-2 number, since 2×869869² = 1513344154322, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (869863) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10972 + ... + 11050.

2⁸⁶⁹⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

869869 is a deficient number, since it is larger than the sum of its proper divisors (321811).

869869 is a wasteful number, since it uses less digits than its factorization.

869869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121 (or 110 counting only the distinct ones).

The product of its digits is 186624, while the sum is 46.

The square root of 869869 is about 932.6676792942. The cubic root of 869869 is about 95.4592353636.

Subtracting 869869 from its reverse (968968), we obtain a palindrome (99099).

The spelling of 869869 in words is "eight hundred sixty-nine thousand, eight hundred sixty-nine".