2640123 has 12 divisors (see below), whose sum is σ = 3832920. Its totient is φ = 1751136.

The previous prime is 2640067. The next prime is 2640137. The reversal of 2640123 is 3210462.

It is a happy number.

2640123 is a `hidden beast` number, since 2 + 640 + 1 + 23 = 666.

2640123 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2640123 - 2⁶ = 2640059 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2640096 and 2640105.

It is not an unprimeable number, because it can be changed into a prime (2640163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1468 + ... + 2726.

It is an arithmetic number, because the mean of its divisors is an integer number (319410).

2^2640123 is an apocalyptic number.

2640123 is a deficient number, since it is larger than the sum of its proper divisors (1192797).

2640123 is a wasteful number, since it uses less digits than its factorization.

2640123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1498 (or 1495 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 2640123 is about 1624.8455311198. The cubic root of 2640123 is about 138.2106109862.

Adding to 2640123 its reverse (3210462), we get a palindrome (5850585).

The spelling of 2640123 in words is "two million, six hundred forty thousand, one hundred twenty-three".