872421 has 8 divisors (see below), whose sum is σ = 1269024. Its totient is φ = 528720.

The previous prime is 872419. The next prime is 872429. The reversal of 872421 is 124278.

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

It is not a de Polignac number, because 872421 - 2¹ = 872419 is a prime.

It is a super-2 number, since 2×872421² = 1522236802482, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 872391 and 872400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (872429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13186 + ... + 13251.

It is an arithmetic number, because the mean of its divisors is an integer number (158628).

2⁸⁷²⁴²¹ is an apocalyptic number.

It is an amenable number.

872421 is a deficient number, since it is larger than the sum of its proper divisors (396603).

872421 is a wasteful number, since it uses less digits than its factorization.

872421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26451.

The product of its digits is 896, while the sum is 24.

The square root of 872421 is about 934.0347959257. The cubic root of 872421 is about 95.5524961963.

Adding to 872421 its reverse (124278), we get a palindrome (996699).

The spelling of 872421 in words is "eight hundred seventy-two thousand, four hundred twenty-one".