2891856 has 40 divisors (see below), whose sum is σ = 8151264. Its totient is φ = 876160.

The previous prime is 2891831. The next prime is 2891891. The reversal of 2891856 is 6581982.

It is a super-2 number, since 2×2891856² = 16725662249472, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2211 + ... + 3266.

2^2891856 is an apocalyptic number.

It is an amenable number.

2891856 is an abundant number, since it is smaller than the sum of its proper divisors (5259408).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2891856 is a wasteful number, since it uses less digits than its factorization.

2891856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5499 (or 5493 counting only the distinct ones).

The product of its digits is 34560, while the sum is 39.

The square root of 2891856 is about 1700.5457947377. The cubic root of 2891856 is about 142.4706988077.

It can be divided in two parts, 289 and 1856, that added together give a triangular number (2145 = T₆₅).

The spelling of 2891856 in words is "two million, eight hundred ninety-one thousand, eight hundred fifty-six".