869949 has 6 divisors (see below), whose sum is σ = 1256606. Its totient is φ = 579960.

The previous prime is 869927. The next prime is 869951. The reversal of 869949 is 949968.

It can be written as a sum of positive squares in only one way, i.e., 842724 + 27225 = 918^2 + 165^2 .

It is not a de Polignac number, because 869949 - 2⁹ = 869437 is a prime.

It is a super-2 number, since 2×869949² = 1513622525202, which contains 22 as substring.

It is a Duffinian number.

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 869949.

It is not an unprimeable number, because it can be changed into a prime (869909) 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 in 5 ways as a sum of consecutive naturals, for example, 48322 + ... + 48339.

2⁸⁶⁹⁹⁴⁹ is an apocalyptic number.

It is an amenable number.

869949 is a deficient number, since it is larger than the sum of its proper divisors (386657).

869949 is a wasteful number, since it uses less digits than its factorization.

869949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96667 (or 96664 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 869949 is about 932.7105660386. The cubic root of 869949 is about 95.4621616681.

The spelling of 869949 in words is "eight hundred sixty-nine thousand, nine hundred forty-nine".