869649 has 24 divisors (see below), whose sum is σ = 1353312. Its totient is φ = 492480.

The previous prime is 869599. The next prime is 869657. The reversal of 869649 is 946968.

It is not a de Polignac number, because 869649 - 2⁷ = 869521 is a prime.

It is a nialpdrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 869649.

It is not an unprimeable number, because it can be changed into a prime (869689) 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, 11877 + ... + 11949.

It is an arithmetic number, because the mean of its divisors is an integer number (56388).

2⁸⁶⁹⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

869649 is a deficient number, since it is larger than the sum of its proper divisors (483663).

869649 is a wasteful number, since it uses less digits than its factorization.

869649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125 (or 106 counting only the distinct ones).

The product of its digits is 93312, while the sum is 42.

The square root of 869649 is about 932.5497305774. The cubic root of 869649 is about 95.4511871010.

The spelling of 869649 in words is "eight hundred sixty-nine thousand, six hundred forty-nine".