2211864 has 32 divisors (see below), whose sum is σ = 5771520. Its totient is φ = 705056.

The previous prime is 2211821. The next prime is 2211883. The reversal of 2211864 is 4681122.

2211864 = T₂₁₁ + T₂₁₂ + ... + T₂₈₂.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1452 + ... + 2555.

It is an arithmetic number, because the mean of its divisors is an integer number (180360).

2^2211864 is an apocalyptic number.

2211864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2211864 is an abundant number, since it is smaller than the sum of its proper divisors (3559656).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2211864 is a wasteful number, since it uses less digits than its factorization.

2211864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4039 (or 4035 counting only the distinct ones).

The product of its digits is 768, while the sum is 24.

The square root of 2211864 is about 1487.2336736371. The cubic root of 2211864 is about 130.2925168479.

Adding to 2211864 its reverse (4681122), we get a palindrome (6892986).

The spelling of 2211864 in words is "two million, two hundred eleven thousand, eight hundred sixty-four".