2640813 has 8 divisors (see below), whose sum is σ = 4024128. Its totient is φ = 1509024.

The previous prime is 2640779. The next prime is 2640821. The reversal of 2640813 is 3180462.

It is a happy number.

2640813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 2640813 - 2⁶ = 2640749 is a prime.

It is an Ulam number.

2640813 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640823) 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 7 ways as a sum of consecutive naturals, for example, 62856 + ... + 62897.

It is an arithmetic number, because the mean of its divisors is an integer number (503016).

2^2640813 is an apocalyptic number.

It is an amenable number.

2640813 is a deficient number, since it is larger than the sum of its proper divisors (1383315).

2640813 is a wasteful number, since it uses less digits than its factorization.

2640813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125763.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 2640813 is about 1625.0578451243. The cubic root of 2640813 is about 138.2226504524. Note that the first 3 decimals are identical.

The spelling of 2640813 in words is "two million, six hundred forty thousand, eight hundred thirteen".