2643955 has 4 divisors (see below), whose sum is σ = 3172752. Its totient is φ = 2115160.

The previous prime is 2643947. The next prime is 2643961. The reversal of 2643955 is 5593462.

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

It is not a de Polignac number, because 2643955 - 2³ = 2643947 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2643955.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 264391 + ... + 264400.

It is an arithmetic number, because the mean of its divisors is an integer number (793188).

2^2643955 is an apocalyptic number.

2643955 is a deficient number, since it is larger than the sum of its proper divisors (528797).

2643955 is an equidigital number, since it uses as much as digits as its factorization.

2643955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528796.

The product of its digits is 32400, while the sum is 34.

The square root of 2643955 is about 1626.0242925615. The cubic root of 2643955 is about 138.2774471434.

The spelling of 2643955 in words is "two million, six hundred forty-three thousand, nine hundred fifty-five".