4228639 has 4 divisors (see below), whose sum is σ = 4253256. Its totient is φ = 4204024.

The previous prime is 4228613. The next prime is 4228649. The reversal of 4228639 is 9368224.

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

It is a cyclic number.

It is not a de Polignac number, because 4228639 - 2¹⁵ = 4195871 is a prime.

It is a Duffinian number.

4228639 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4228649) 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, 12049 + ... + 12394.

It is an arithmetic number, because the mean of its divisors is an integer number (1063314).

Almost surely, 2^4228639 is an apocalyptic number.

4228639 is a deficient number, since it is larger than the sum of its proper divisors (24617).

4228639 is a wasteful number, since it uses less digits than its factorization.

4228639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24616.

The product of its digits is 20736, while the sum is 34.

The square root of 4228639 is about 2056.3654830793. The cubic root of 4228639 is about 161.7087562970.

The spelling of 4228639 in words is "four million, two hundred twenty-eight thousand, six hundred thirty-nine".