2640955 has 4 divisors (see below), whose sum is σ = 3169152. Its totient is φ = 2112760.

The previous prime is 2640947. The next prime is 2640959. The reversal of 2640955 is 5590462.

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

It is not a de Polignac number, because 2640955 - 2³ = 2640947 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2640959) 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, 264091 + ... + 264100.

It is an arithmetic number, because the mean of its divisors is an integer number (792288).

2^2640955 is an apocalyptic number.

2640955 is a deficient number, since it is larger than the sum of its proper divisors (528197).

2640955 is an equidigital number, since it uses as much as digits as its factorization.

2640955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528196.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 2640955 is about 1625.1015352894. The cubic root of 2640955 is about 138.2251278795.

The spelling of 2640955 in words is "two million, six hundred forty thousand, nine hundred fifty-five".