2840661 has 12 divisors (see below), whose sum is σ = 4281888. Its totient is φ = 1811304.

The previous prime is 2840657. The next prime is 2840681. The reversal of 2840661 is 1660482.

2840661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2840661 - 2² = 2840657 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

2840661 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2840681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6655 + ... + 7068.

It is an arithmetic number, because the mean of its divisors is an integer number (356824).

2^2840661 is an apocalyptic number.

It is an amenable number.

2840661 is a deficient number, since it is larger than the sum of its proper divisors (1441227).

2840661 is a wasteful number, since it uses less digits than its factorization.

2840661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13752 (or 13749 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 2840661 is about 1685.4260588943. The cubic root of 2840661 is about 141.6249608875.

The spelling of 2840661 in words is "two million, eight hundred forty thousand, six hundred sixty-one".