867421 has 4 divisors (see below), whose sum is σ = 871744. Its totient is φ = 863100.

The previous prime is 867413. The next prime is 867431. The reversal of 867421 is 124768.

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 867421 - 2³ = 867413 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 867421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (867401) 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, 1845 + ... + 2266.

It is an arithmetic number, because the mean of its divisors is an integer number (217936).

2⁸⁶⁷⁴²¹ is an apocalyptic number.

It is an amenable number.

867421 is a deficient number, since it is larger than the sum of its proper divisors (4323).

867421 is a wasteful number, since it uses less digits than its factorization.

867421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4322.

The product of its digits is 2688, while the sum is 28.

The square root of 867421 is about 931.3543901223. The cubic root of 867421 is about 95.3696035669.

The spelling of 867421 in words is "eight hundred sixty-seven thousand, four hundred twenty-one".