2640863 has 2 divisors, whose sum is σ = 2640864. Its totient is φ = 2640862.

The previous prime is 2640857. The next prime is 2640871. The reversal of 2640863 is 3680462.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2640863 - 2¹⁶ = 2575327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2640823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1320431 + 1320432.

It is an arithmetic number, because the mean of its divisors is an integer number (1320432).

2^2640863 is an apocalyptic number.

2640863 is a deficient number, since it is larger than the sum of its proper divisors (1).

2640863 is an equidigital number, since it uses as much as digits as its factorization.

2640863 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 2640863 is about 1625.0732291192. The cubic root of 2640863 is about 138.2235227960.

The spelling of 2640863 in words is "two million, six hundred forty thousand, eight hundred sixty-three".