6638923 has 8 divisors (see below), whose sum is σ = 7078400. Its totient is φ = 6208488.

The previous prime is 6638911. The next prime is 6638953. The reversal of 6638923 is 3298366.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6638923 is a prime.

6638923 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6638903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 711 + ... + 3712.

It is an arithmetic number, because the mean of its divisors is an integer number (884800).

Almost surely, 2^6638923 is an apocalyptic number.

6638923 is a deficient number, since it is larger than the sum of its proper divisors (439477).

6638923 is a wasteful number, since it uses less digits than its factorization.

6638923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4521.

The product of its digits is 46656, while the sum is 37.

The square root of 6638923 is about 2576.6107583413. The cubic root of 6638923 is about 187.9457648746.

The spelling of 6638923 in words is "six million, six hundred thirty-eight thousand, nine hundred twenty-three".