6621039 has 24 divisors (see below), whose sum is σ = 10018320. Its totient is φ = 4209408.

The previous prime is 6621029. The next prime is 6621061. The reversal of 6621039 is 9301266.

It is a happy number.

6621039 is a `hidden beast` number, since 6 + 621 + 0 + 39 = 666.

It is not a de Polignac number, because 6621039 - 2¹¹ = 6618991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6621029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19479 + ... + 19815.

It is an arithmetic number, because the mean of its divisors is an integer number (417430).

Almost surely, 2^6621039 is an apocalyptic number.

6621039 is a deficient number, since it is larger than the sum of its proper divisors (3397281).

6621039 is a wasteful number, since it uses less digits than its factorization.

6621039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439 (or 436 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 6621039 is about 2573.1379675408. The cubic root of 6621039 is about 187.7768496881.

The spelling of 6621039 in words is "six million, six hundred twenty-one thousand, thirty-nine".