4656639 has 16 divisors (see below), whose sum is σ = 6742400. Its totient is φ = 2841696.

The previous prime is 4656629. The next prime is 4656643. The reversal of 4656639 is 9366564.

It is a happy number.

It is not a de Polignac number, because 4656639 - 2⁵ = 4656607 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4656597 and 4656606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4656629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4992 + ... + 5850.

It is an arithmetic number, because the mean of its divisors is an integer number (421400).

Almost surely, 2^4656639 is an apocalyptic number.

4656639 is a deficient number, since it is larger than the sum of its proper divisors (2085761).

4656639 is a wasteful number, since it uses less digits than its factorization.

4656639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1014.

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

The square root of 4656639 is about 2157.9246974814. The cubic root of 4656639 is about 166.9901508528.

The spelling of 4656639 in words is "four million, six hundred fifty-six thousand, six hundred thirty-nine".