2840863 has 4 divisors (see below), whose sum is σ = 2863360. Its totient is φ = 2818368.

The previous prime is 2840857. The next prime is 2840911. The reversal of 2840863 is 3680482.

2840863 = 82² + 83² + ... + 208².

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2840863 - 2²¹ = 743711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2840263) by changing a digit.

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, 11058 + ... + 11311.

It is an arithmetic number, because the mean of its divisors is an integer number (715840).

2^2840863 is an apocalyptic number.

2840863 is a deficient number, since it is larger than the sum of its proper divisors (22497).

2840863 is a wasteful number, since it uses less digits than its factorization.

2840863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22496.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 2840863 is about 1685.4859833294. The cubic root of 2840863 is about 141.6283178014.

It can be divided in two parts, 284086 and 3, that multiplied together give a palindrome (852258).

The spelling of 2840863 in words is "two million, eight hundred forty thousand, eight hundred sixty-three".