2111864 has 8 divisors (see below), whose sum is σ = 3959760. Its totient is φ = 1055928.

The previous prime is 2111861. The next prime is 2111873. The reversal of 2111864 is 4681112.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131984 + ... + 131999.

It is an arithmetic number, because the mean of its divisors is an integer number (494970).

2^2111864 is an apocalyptic number.

It is an amenable number.

2111864 is a deficient number, since it is larger than the sum of its proper divisors (1847896).

2111864 is a wasteful number, since it uses less digits than its factorization.

2111864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263989 (or 263985 counting only the distinct ones).

The product of its digits is 384, while the sum is 23.

The square root of 2111864 is about 1453.2253782535. The cubic root of 2111864 is about 128.2986191971.

Adding to 2111864 its reverse (4681112), we get a palindrome (6792976).

The spelling of 2111864 in words is "two million, one hundred eleven thousand, eight hundred sixty-four".