288421 has 4 divisors (see below), whose sum is σ = 329632. Its totient is φ = 247212.

The previous prime is 288413. The next prime is 288427. The reversal of 288421 is 124882.

288421 is nontrivially palindromic in base 14.

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 not a de Polignac number, because 288421 - 2³ = 288413 is a prime.

It is a pancake number, because a pancake can be divided into 288421 parts by 759 straight cuts.

It is a Duffinian number.

288421 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (288427) 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, 20595 + ... + 20608.

It is an arithmetic number, because the mean of its divisors is an integer number (82408).

2²⁸⁸⁴²¹ is an apocalyptic number.

It is an amenable number.

288421 is a deficient number, since it is larger than the sum of its proper divisors (41211).

288421 is an equidigital number, since it uses as much as digits as its factorization.

288421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41210.

The product of its digits is 1024, while the sum is 25.

The square root of 288421 is about 537.0484149497. The cubic root of 288421 is about 66.0707078150.

The spelling of 288421 in words is "two hundred eighty-eight thousand, four hundred twenty-one".