2891865 has 8 divisors (see below), whose sum is σ = 4627008. Its totient is φ = 1542320.

The previous prime is 2891831. The next prime is 2891891. The reversal of 2891865 is 5681982.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2891865 - 2⁷ = 2891737 is a prime.

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, 96381 + ... + 96410.

It is an arithmetic number, because the mean of its divisors is an integer number (578376).

2^2891865 is an apocalyptic number.

It is an amenable number.

2891865 is a deficient number, since it is larger than the sum of its proper divisors (1735143).

2891865 is a wasteful number, since it uses less digits than its factorization.

2891865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192799.

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

The square root of 2891865 is about 1700.5484409449. The cubic root of 2891865 is about 142.4708466061.

The spelling of 2891865 in words is "two million, eight hundred ninety-one thousand, eight hundred sixty-five".