2172644 has 6 divisors (see below), whose sum is σ = 3802134. Its totient is φ = 1086320.

The previous prime is 2172641. The next prime is 2172659. The reversal of 2172644 is 4462712.

It can be written as a sum of positive squares in only one way, i.e., 1532644 + 640000 = 1238^2 + 800^2 .

It is not an unprimeable number, because it can be changed into a prime (2172641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 271577 + ... + 271584.

It is an arithmetic number, because the mean of its divisors is an integer number (633689).

2^2172644 is an apocalyptic number.

It is an amenable number.

2172644 is a deficient number, since it is larger than the sum of its proper divisors (1629490).

2172644 is a wasteful number, since it uses less digits than its factorization.

2172644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 543165 (or 543163 counting only the distinct ones).

The product of its digits is 2688, while the sum is 26.

The square root of 2172644 is about 1473.9891451432. The cubic root of 2172644 is about 129.5178192858.

The spelling of 2172644 in words is "two million, one hundred seventy-two thousand, six hundred forty-four".