2197864 has 16 divisors (see below), whose sum is σ = 4140900. Its totient is φ = 1093632.

The previous prime is 2197849. The next prime is 2197873. The reversal of 2197864 is 4687912.

2197864 is digitally balanced in base 5, 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 2 ways, for example, as 1988100 + 209764 = 1410^2 + 458^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1522 + ... + 2590.

2^2197864 is an apocalyptic number.

It is an amenable number.

2197864 is a deficient number, since it is larger than the sum of its proper divisors (1943036).

2197864 is a wasteful number, since it uses less digits than its factorization.

2197864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1332 (or 1328 counting only the distinct ones).

The product of its digits is 24192, while the sum is 37.

The square root of 2197864 is about 1482.5194771065. The cubic root of 2197864 is about 130.0170391867.

The spelling of 2197864 in words is "two million, one hundred ninety-seven thousand, eight hundred sixty-four".