6640123 has 8 divisors (see below), whose sum is σ = 7918848. Its totient is φ = 5443944.

The previous prime is 6640121. The next prime is 6640129. The reversal of 6640123 is 3210466.

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

It is a cyclic number.

It is not a de Polignac number, because 6640123 - 2¹ = 6640121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6640094 and 6640103.

It is not an unprimeable number, because it can be changed into a prime (6640121) 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, 20461 + ... + 20782.

It is an arithmetic number, because the mean of its divisors is an integer number (989856).

Almost surely, 2^6640123 is an apocalyptic number.

6640123 is a deficient number, since it is larger than the sum of its proper divisors (1278725).

6640123 is a wasteful number, since it uses less digits than its factorization.

6640123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41273.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 6640123 is about 2576.8436118632. The cubic root of 6640123 is about 187.9570880631.

Adding to 6640123 its reverse (3210466), we get a palindrome (9850589).

The spelling of 6640123 in words is "six million, six hundred forty thousand, one hundred twenty-three".