6638972 has 12 divisors (see below), whose sum is σ = 11725560. Its totient is φ = 3288816.

The previous prime is 6638953. The next prime is 6638977. The reversal of 6638972 is 2798366.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6638977) 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 3 ways as a sum of consecutive naturals, for example, 7178 + ... + 8049.

It is an arithmetic number, because the mean of its divisors is an integer number (977130).

Almost surely, 2^6638972 is an apocalyptic number.

It is an amenable number.

6638972 is a deficient number, since it is larger than the sum of its proper divisors (5086588).

6638972 is a wasteful number, since it uses less digits than its factorization.

6638972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15340 (or 15338 counting only the distinct ones).

The product of its digits is 108864, while the sum is 41.

The square root of 6638972 is about 2576.6202669388. The cubic root of 6638972 is about 187.9462272648.

Subtracting from 6638972 its reverse (2798366), we obtain a triangular number (3840606 = T₂₇₇₁).

The spelling of 6638972 in words is "six million, six hundred thirty-eight thousand, nine hundred seventy-two".