2172428 has 12 divisors (see below), whose sum is σ = 3814440. Its totient is φ = 1082592.

The previous prime is 2172427. The next prime is 2172433. The reversal of 2172428 is 8242712.

It is a junction number, because it is equal to n+sod(n) for n = 2172397 and 2172406.

It is not an unprimeable number, because it can be changed into a prime (2172427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 800 + ... + 2232.

It is an arithmetic number, because the mean of its divisors is an integer number (317870).

2^2172428 is an apocalyptic number.

It is an amenable number.

2172428 is a deficient number, since it is larger than the sum of its proper divisors (1642012).

2172428 is a wasteful number, since it uses less digits than its factorization.

2172428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1816 (or 1814 counting only the distinct ones).

The product of its digits is 1792, while the sum is 26.

The square root of 2172428 is about 1473.9158727689. The cubic root of 2172428 is about 129.5135270078.

The spelling of 2172428 in words is "two million, one hundred seventy-two thousand, four hundred twenty-eight".