2891855 has 4 divisors (see below), whose sum is σ = 3470232. Its totient is φ = 2313480.

The previous prime is 2891831. The next prime is 2891891. The reversal of 2891855 is 5581982.

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

It is not a de Polignac number, because 2891855 - 2⁸ = 2891599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 289181 + ... + 289190.

It is an arithmetic number, because the mean of its divisors is an integer number (867558).

2^2891855 is an apocalyptic number.

2891855 is a deficient number, since it is larger than the sum of its proper divisors (578377).

2891855 is an equidigital number, since it uses as much as digits as its factorization.

2891855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578376.

The product of its digits is 28800, while the sum is 38.

The square root of 2891855 is about 1700.5455007144. The cubic root of 2891855 is about 142.4706823856.

The spelling of 2891855 in words is "two million, eight hundred ninety-one thousand, eight hundred fifty-five".