2640923 has 4 divisors (see below), whose sum is σ = 2664408. Its totient is φ = 2617440.

The previous prime is 2640919. The next prime is 2640941. The reversal of 2640923 is 3290462.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2640923 - 2² = 2640919 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2640892 and 2640901.

It is not an unprimeable number, because it can be changed into a prime (2640973) 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, 11573 + ... + 11798.

It is an arithmetic number, because the mean of its divisors is an integer number (666102).

2^2640923 is an apocalyptic number.

2640923 is a deficient number, since it is larger than the sum of its proper divisors (23485).

2640923 is a wasteful number, since it uses less digits than its factorization.

2640923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23484.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 2640923 is about 1625.0916897209. The cubic root of 2640923 is about 138.2245695938.

The spelling of 2640923 in words is "two million, six hundred forty thousand, nine hundred twenty-three".