2640423 has 16 divisors (see below), whose sum is σ = 3891456. Its totient is φ = 1584000.

The previous prime is 2640409. The next prime is 2640497. The reversal of 2640423 is 3240462.

It is not a de Polignac number, because 2640423 - 2⁸ = 2640167 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2640423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48 + ... + 2298.

It is an arithmetic number, because the mean of its divisors is an integer number (243216).

2^2640423 is an apocalyptic number.

2640423 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

2640423 is a deficient number, since it is larger than the sum of its proper divisors (1251033).

2640423 is a wasteful number, since it uses less digits than its factorization.

2640423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2294.

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 2640423 is about 1624.9378449652. The cubic root of 2640423 is about 138.2158457945.

Adding to 2640423 its reverse (3240462), we get a palindrome (5880885).

The spelling of 2640423 in words is "two million, six hundred forty thousand, four hundred twenty-three".