860421 has 8 divisors (see below), whose sum is σ = 1214784. Its totient is φ = 539840.

The previous prime is 860417. The next prime is 860423. The reversal of 860421 is 124068.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 860421 - 2² = 860417 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (860423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8385 + ... + 8486.

It is an arithmetic number, because the mean of its divisors is an integer number (151848).

2⁸⁶⁰⁴²¹ is an apocalyptic number.

It is an amenable number.

860421 is a deficient number, since it is larger than the sum of its proper divisors (354363).

860421 is a wasteful number, since it uses less digits than its factorization.

860421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16891.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 860421 is about 927.5888097643. The cubic root of 860421 is about 95.1123693416.

Adding to 860421 its reverse (124068), we get a palindrome (984489).

The spelling of 860421 in words is "eight hundred sixty thousand, four hundred twenty-one".