6638538 has 8 divisors (see below), whose sum is σ = 13277088. Its totient is φ = 2212844.

The previous prime is 6638531. The next prime is 6638549. The reversal of 6638538 is 8358366.

It is a sphenic number, since it is the product of 3 distinct primes.

6638538 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 6638496 and 6638505.

It is not an unprimeable number, because it can be changed into a prime (6638531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 553206 + ... + 553217.

It is an arithmetic number, because the mean of its divisors is an integer number (1659636).

Almost surely, 2^6638538 is an apocalyptic number.

6638538 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6638538 is a wasteful number, since it uses less digits than its factorization.

6638538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1106428.

The product of its digits is 103680, while the sum is 39.

The square root of 6638538 is about 2576.5360467108. The cubic root of 6638538 is about 187.9421317292.

The spelling of 6638538 in words is "six million, six hundred thirty-eight thousand, five hundred thirty-eight".