2643855 has 16 divisors (see below), whose sum is σ = 4329600. Its totient is φ = 1376928.

The previous prime is 2643853. The next prime is 2643871. The reversal of 2643855 is 5583462.

It is not a de Polignac number, because 2643855 - 2¹ = 2643853 is a prime.

It is a super-2 number, since 2×2643855² = 13979938522050, which contains 22 as substring.

It is a d-powerful number, because it can be written as 2²⁰ + 6 + 4⁴ + 3¹³ + 8² + 5 + 5⁴ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2643853) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1405 + ... + 2694.

It is an arithmetic number, because the mean of its divisors is an integer number (270600).

2^2643855 is an apocalyptic number.

2643855 is a deficient number, since it is larger than the sum of its proper divisors (1685745).

2643855 is a wasteful number, since it uses less digits than its factorization.

2643855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4150.

The product of its digits is 28800, while the sum is 33.

The square root of 2643855 is about 1625.9935424226. The cubic root of 2643855 is about 138.2757038058.

The spelling of 2643855 in words is "two million, six hundred forty-three thousand, eight hundred fifty-five".