6639941 has 24 divisors (see below), whose sum is σ = 8580096. Its totient is φ = 5080320.

The previous prime is 6639937. The next prime is 6639943. The reversal of 6639941 is 1499366.

It is not a de Polignac number, because 6639941 - 2² = 6639937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6639895 and 6639904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6639943) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 52220 + ... + 52346.

It is an arithmetic number, because the mean of its divisors is an integer number (357504).

Almost surely, 2^6639941 is an apocalyptic number.

It is an amenable number.

6639941 is a deficient number, since it is larger than the sum of its proper divisors (1940155).

6639941 is a wasteful number, since it uses less digits than its factorization.

6639941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249 (or 242 counting only the distinct ones).

The product of its digits is 34992, while the sum is 38.

The square root of 6639941 is about 2576.8082970993. The cubic root of 6639941 is about 187.9553708006.

The spelling of 6639941 in words is "six million, six hundred thirty-nine thousand, nine hundred forty-one".