6639453 has 6 divisors (see below), whose sum is σ = 9590334. Its totient is φ = 4426296.

The previous prime is 6639449. The next prime is 6639467. The reversal of 6639453 is 3549366.

It can be written as a sum of positive squares in only one way, i.e., 4149369 + 2490084 = 2037^2 + 1578^2 .

It is not a de Polignac number, because 6639453 - 2² = 6639449 is a prime.

It is a super-2 number, since 2×6639453² = 88164672278418, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6639653) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 368850 + ... + 368867.

It is an arithmetic number, because the mean of its divisors is an integer number (1598389).

Almost surely, 2^6639453 is an apocalyptic number.

It is an amenable number.

6639453 is a deficient number, since it is larger than the sum of its proper divisors (2950881).

6639453 is a wasteful number, since it uses less digits than its factorization.

6639453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737723 (or 737720 counting only the distinct ones).

The product of its digits is 58320, while the sum is 36.

The square root of 6639453 is about 2576.7136045746. The cubic root of 6639453 is about 187.9507661178.

The spelling of 6639453 in words is "six million, six hundred thirty-nine thousand, four hundred fifty-three".