2640819 has 8 divisors (see below), whose sum is σ = 3540112. Its totient is φ = 1751040.

The previous prime is 2640779. The next prime is 2640821. The reversal of 2640819 is 9180462.

2640819 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 2640819 - 2¹¹ = 2638771 is a prime.

It is a super-2 number, since 2×2640819² = 13947849981522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2640889) 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, 1702 + ... + 2859.

It is an arithmetic number, because the mean of its divisors is an integer number (442514).

2^2640819 is an apocalyptic number.

2640819 is a deficient number, since it is larger than the sum of its proper divisors (899293).

2640819 is a wasteful number, since it uses less digits than its factorization.

2640819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4757.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 2640819 is about 1625.0596912114. The cubic root of 2640819 is about 138.2227551342. Note that the first 3 decimals are identical.

It can be divided in two parts, 2640 and 819, that multiplied together give a triangular number (2162160 = T₂₀₇₉).

The spelling of 2640819 in words is "two million, six hundred forty thousand, eight hundred nineteen".