2787861 has 12 divisors (see below), whose sum is σ = 3844896. Its totient is φ = 1796760.

The previous prime is 2787859. The next prime is 2787907. The reversal of 2787861 is 1687872.

It is not a de Polignac number, because 2787861 - 2¹ = 2787859 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2787061) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2400 + ... + 3366.

It is an arithmetic number, because the mean of its divisors is an integer number (320408).

2^2787861 is an apocalyptic number.

It is an amenable number.

2787861 is a deficient number, since it is larger than the sum of its proper divisors (1057035).

2787861 is an equidigital number, since it uses as much as digits as its factorization.

2787861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1032 (or 1001 counting only the distinct ones).

The product of its digits is 37632, while the sum is 39.

The square root of 2787861 is about 1669.6888931774. The cubic root of 2787861 is about 140.7419958704.

The spelling of 2787861 in words is "two million, seven hundred eighty-seven thousand, eight hundred sixty-one".