427921 has 4 divisors (see below), whose sum is σ = 460852. Its totient is φ = 394992.

The previous prime is 427919. The next prime is 427939. The reversal of 427921 is 129724.

427921 is nontrivially palindromic in base 12.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 140625 + 287296 = 375^2 + 536^2 .

It is not a de Polignac number, because 427921 - 2¹ = 427919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (427951) 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, 16446 + ... + 16471.

It is an arithmetic number, because the mean of its divisors is an integer number (115213).

2⁴²⁷⁹²¹ is an apocalyptic number.

It is an amenable number.

427921 is a deficient number, since it is larger than the sum of its proper divisors (32931).

427921 is a wasteful number, since it uses less digits than its factorization.

427921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32930.

The product of its digits is 1008, while the sum is 25.

The square root of 427921 is about 654.1567090537. The cubic root of 427921 is about 75.3565834380.

The spelling of 427921 in words is "four hundred twenty-seven thousand, nine hundred twenty-one".