4665639 has 12 divisors (see below), whose sum is σ = 6838328. Its totient is φ = 2827440.

The previous prime is 4665553. The next prime is 4665653. The reversal of 4665639 is 9365664.

It is a happy number.

It is not a de Polignac number, because 4665639 - 2¹² = 4661543 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4665597 and 4665606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4665139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6064 + ... + 6789.

Almost surely, 2^4665639 is an apocalyptic number.

4665639 is a deficient number, since it is larger than the sum of its proper divisors (2172689).

4665639 is a wasteful number, since it uses less digits than its factorization.

4665639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12878 (or 12867 counting only the distinct ones).

The product of its digits is 116640, while the sum is 39.

The square root of 4665639 is about 2160.0090277589. The cubic root of 4665639 is about 167.0976636002.

Subtracting from 4665639 its sum of digits (39), we obtain a square (4665600 = 2160²).

It can be divided in two parts, 466 and 5639, that added together give a triangular number (6105 = T₁₁₀).

The spelling of 4665639 in words is "four million, six hundred sixty-five thousand, six hundred thirty-nine".