2840081 has 4 divisors (see below), whose sum is σ = 2850612. Its totient is φ = 2829552.

The previous prime is 2840077. The next prime is 2840087. The reversal of 2840081 is 1800482.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1800482 = 2 ⋅900241.

It can be written as a sum of positive squares in 2 ways, for example, as 409600 + 2430481 = 640^2 + 1559^2 .

It is a cyclic number.

It is not a de Polignac number, because 2840081 - 2² = 2840077 is a prime.

It is a super-2 number, since 2×2840081² = 16132120173122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2840087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4850 + ... + 5403.

It is an arithmetic number, because the mean of its divisors is an integer number (712653).

2^2840081 is an apocalyptic number.

It is an amenable number.

2840081 is a deficient number, since it is larger than the sum of its proper divisors (10531).

2840081 is a wasteful number, since it uses less digits than its factorization.

2840081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10530.

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 2840081 is about 1685.2539867925. The cubic root of 2840081 is about 141.6153213389.

The spelling of 2840081 in words is "two million, eight hundred forty thousand, eighty-one".