875421 has 8 divisors (see below), whose sum is σ = 1296960. Its totient is φ = 583596.

The previous prime is 875419. The next prime is 875429. The reversal of 875421 is 124578.

It is not a de Polignac number, because 875421 - 2¹ = 875419 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 32423 = 875421 / (8 + 7 + 5 + 4 + 2 + 1).

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (875429) 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, 16185 + ... + 16238.

It is an arithmetic number, because the mean of its divisors is an integer number (162120).

2⁸⁷⁵⁴²¹ is an apocalyptic number.

It is an amenable number.

875421 is a deficient number, since it is larger than the sum of its proper divisors (421539).

875421 is a wasteful number, since it uses less digits than its factorization.

875421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32432 (or 32426 counting only the distinct ones).

The product of its digits is 2240, while the sum is 27.

The square root of 875421 is about 935.6393535973. The cubic root of 875421 is about 95.6618965653.

875421 divided by its sum of digits (27) gives a palindrome (32423).

Subtracting from 875421 its product of digits (2240), we obtain a triangular number (873181 = T₁₃₂₁).

Adding to 875421 its reverse (124578), we get a palindrome (999999).

It can be divided in two parts, 875 and 421, that added together give a 4-th power (1296 = 6⁴).

The spelling of 875421 in words is "eight hundred seventy-five thousand, four hundred twenty-one".