6639455 has 16 divisors (see below), whose sum is σ = 8570880. Its totient is φ = 4921632.

The previous prime is 6639449. The next prime is 6639467. The reversal of 6639455 is 5549366.

It is a cyclic number.

It is not a de Polignac number, because 6639455 - 2⁴ = 6639439 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3722 + ... + 5208.

It is an arithmetic number, because the mean of its divisors is an integer number (535680).

Almost surely, 2^6639455 is an apocalyptic number.

6639455 is a deficient number, since it is larger than the sum of its proper divisors (1931425).

6639455 is a wasteful number, since it uses less digits than its factorization.

6639455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1558.

The product of its digits is 97200, while the sum is 38.

The square root of 6639455 is about 2576.7139926659. The cubic root of 6639455 is about 187.9507849899.

The spelling of 6639455 in words is "six million, six hundred thirty-nine thousand, four hundred fifty-five".