2011864 has 8 divisors (see below), whose sum is σ = 3772260. Its totient is φ = 1005928.

The previous prime is 2011861. The next prime is 2011897. The reversal of 2011864 is 4681102.

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 (2011861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125734 + ... + 125749.

2^2011864 is an apocalyptic number.

It is an amenable number.

2011864 is a deficient number, since it is larger than the sum of its proper divisors (1760396).

2011864 is a wasteful number, since it uses less digits than its factorization.

2011864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251489 (or 251485 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 2011864 is about 1418.4019176524. The cubic root of 2011864 is about 126.2407423856.

Adding to 2011864 its reverse (4681102), we get a palindrome (6692966).

The spelling of 2011864 in words is "two million, eleven thousand, eight hundred sixty-four".