869691 has 4 divisors (see below), whose sum is σ = 1159592. Its totient is φ = 579792.

The previous prime is 869689. The next prime is 869707. The reversal of 869691 is 196968.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 869691 - 2¹ = 869689 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (869291) 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 3 ways as a sum of consecutive naturals, for example, 144946 + ... + 144951.

It is an arithmetic number, because the mean of its divisors is an integer number (289898).

2⁸⁶⁹⁶⁹¹ is an apocalyptic number.

869691 is a deficient number, since it is larger than the sum of its proper divisors (289901).

869691 is a wasteful number, since it uses less digits than its factorization.

869691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289900.

The product of its digits is 23328, while the sum is 39.

The square root of 869691 is about 932.5722492118. The cubic root of 869691 is about 95.4527236923.

The spelling of 869691 in words is "eight hundred sixty-nine thousand, six hundred ninety-one".