2191628 has 12 divisors (see below), whose sum is σ = 3889872. Its totient is φ = 1080240.

The previous prime is 2191627. The next prime is 2191633. The reversal of 2191628 is 8261912.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 2191628.

It is not an unprimeable number, because it can be changed into a prime (2191627) 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, 3575 + ... + 4142.

It is an arithmetic number, because the mean of its divisors is an integer number (324156).

2^2191628 is an apocalyptic number.

It is an amenable number.

2191628 is a deficient number, since it is larger than the sum of its proper divisors (1698244).

2191628 is a wasteful number, since it uses less digits than its factorization.

2191628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7792 (or 7790 counting only the distinct ones).

The product of its digits is 1728, while the sum is 29.

The square root of 2191628 is about 1480.4148067349. The cubic root of 2191628 is about 129.8939569150.

The spelling of 2191628 in words is "two million, one hundred ninety-one thousand, six hundred twenty-eight".