869129 has 4 divisors (see below), whose sum is σ = 883920. Its totient is φ = 854340.

The previous prime is 869119. The next prime is 869131. The reversal of 869129 is 921968.

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 not a de Polignac number, because 869129 - 2⁸ = 868873 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (869119) 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, 7307 + ... + 7424.

It is an arithmetic number, because the mean of its divisors is an integer number (220980).

2⁸⁶⁹¹²⁹ is an apocalyptic number.

It is an amenable number.

869129 is a deficient number, since it is larger than the sum of its proper divisors (14791).

869129 is a wasteful number, since it uses less digits than its factorization.

869129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14790.

The product of its digits is 7776, while the sum is 35.

The square root of 869129 is about 932.2708833810. The cubic root of 869129 is about 95.4321585376.

It can be divided in two parts, 869 and 129, that multiplied together give a triangular number (112101 = T₄₇₃).

The spelling of 869129 in words is "eight hundred sixty-nine thousand, one hundred twenty-nine".