2156644 has 12 divisors (see below), whose sum is σ = 4313344. Its totient is φ = 924264.

The previous prime is 2156629. The next prime is 2156647. The reversal of 2156644 is 4466512.

2156644 is an admirable number.

It is a super-2 number, since 2×2156644² = 9302226685472, which contains 22 as substring.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (28), and also a Moran number because the ratio is a prime number: 77023 = 2156644 / (2 + 1 + 5 + 6 + 6 + 4 + 4).

It is not an unprimeable number, because it can be changed into a prime (2156647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38484 + ... + 38539.

2^2156644 is an apocalyptic number.

It is an amenable number.

2156644 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

2156644 is a wasteful number, since it uses less digits than its factorization.

2156644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77034 (or 77032 counting only the distinct ones).

The product of its digits is 5760, while the sum is 28.

The square root of 2156644 is about 1468.5516674602. The cubic root of 2156644 is about 129.1990996368.

It can be divided in two parts, 215 and 6644, that added together give a cube (6859 = 19³).

The spelling of 2156644 in words is "two million, one hundred fifty-six thousand, six hundred forty-four".