4288639 has 4 divisors (see below), whose sum is σ = 4293000. Its totient is φ = 4284280.

The previous prime is 4288637. The next prime is 4288681. The reversal of 4288639 is 9368824.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 4288639 - 2¹ = 4288637 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4288637) 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, 69 + ... + 2929.

It is an arithmetic number, because the mean of its divisors is an integer number (1073250).

Almost surely, 2^4288639 is an apocalyptic number.

4288639 is a deficient number, since it is larger than the sum of its proper divisors (4361).

4288639 is a wasteful number, since it uses less digits than its factorization.

4288639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4360.

The product of its digits is 82944, while the sum is 40.

The square root of 4288639 is about 2070.9029431627. The cubic root of 4288639 is about 162.4699936706.

The spelling of 4288639 in words is "four million, two hundred eighty-eight thousand, six hundred thirty-nine".