869421 has 16 divisors (see below), whose sum is σ = 1395200. Its totient is φ = 470448.

The previous prime is 869419. The next prime is 869437. The reversal of 869421 is 124968.

It is not a de Polignac number, because 869421 - 2¹ = 869419 is a prime.

It is a Duffinian number.

It is a Curzon number.

869421 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (869461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 691 + ... + 1488.

It is an arithmetic number, because the mean of its divisors is an integer number (87200).

2⁸⁶⁹⁴²¹ is an apocalyptic number.

It is an amenable number.

869421 is a deficient number, since it is larger than the sum of its proper divisors (525779).

869421 is a wasteful number, since it uses less digits than its factorization.

869421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2208.

The product of its digits is 3456, while the sum is 30.

The square root of 869421 is about 932.4274770726. The cubic root of 869421 is about 95.4428447418.

The spelling of 869421 in words is "eight hundred sixty-nine thousand, four hundred twenty-one".