4288421 has 4 divisors (see below), whose sum is σ = 4379712. Its totient is φ = 4197132.

The previous prime is 4288397. The next prime is 4288439. The reversal of 4288421 is 1248824.

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 a cyclic number.

It is not a de Polignac number, because 4288421 - 2¹⁸ = 4026277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4288441) 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, 45575 + ... + 45668.

It is an arithmetic number, because the mean of its divisors is an integer number (1094928).

Almost surely, 2^4288421 is an apocalyptic number.

It is an amenable number.

4288421 is a deficient number, since it is larger than the sum of its proper divisors (91291).

4288421 is an equidigital number, since it uses as much as digits as its factorization.

4288421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91290.

The product of its digits is 4096, while the sum is 29.

The square root of 4288421 is about 2070.8503084482. The cubic root of 4288421 is about 162.4672407336.

The spelling of 4288421 in words is "four million, two hundred eighty-eight thousand, four hundred twenty-one".