2840291 has 4 divisors (see below), whose sum is σ = 2989800. Its totient is φ = 2690784.

The previous prime is 2840281. The next prime is 2840303. The reversal of 2840291 is 1920482.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2840291 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2840291.

It is not an unprimeable number, because it can be changed into a prime (2840261) 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, 74726 + ... + 74763.

It is an arithmetic number, because the mean of its divisors is an integer number (747450).

2^2840291 is an apocalyptic number.

2840291 is a deficient number, since it is larger than the sum of its proper divisors (149509).

2840291 is a wasteful number, since it uses less digits than its factorization.

2840291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149508.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 2840291 is about 1685.3162907894. The cubic root of 2840291 is about 141.6188116719.

The spelling of 2840291 in words is "two million, eight hundred forty thousand, two hundred ninety-one".