2861864 has 8 divisors (see below), whose sum is σ = 5366010. Its totient is φ = 1430928.

The previous prime is 2861861. The next prime is 2861869. The reversal of 2861864 is 4681682.

2861864 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 1800964 + 1060900 = 1342^2 + 1030^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (2861861) 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 as a sum of consecutive naturals, namely, 178859 + ... + 178874.

2^2861864 is an apocalyptic number.

It is an amenable number.

2861864 is a deficient number, since it is larger than the sum of its proper divisors (2504146).

2861864 is a wasteful number, since it uses less digits than its factorization.

2861864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357739 (or 357735 counting only the distinct ones).

The product of its digits is 18432, while the sum is 35.

The square root of 2861864 is about 1691.7044659160. The cubic root of 2861864 is about 141.9764557936.

It can be divided in two parts, 28618 and 64, that added together give a palindrome (28682).

The spelling of 2861864 in words is "two million, eight hundred sixty-one thousand, eight hundred sixty-four".