2188993 has 2 divisors, whose sum is σ = 2188994. Its totient is φ = 2188992.

The previous prime is 2188987. The next prime is 2189017. The reversal of 2188993 is 3998812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1373584 + 815409 = 1172^2 + 903^2 .

It is a cyclic number.

It is not a de Polignac number, because 2188993 - 2⁹ = 2188481 is a prime.

It is not a weakly prime, because it can be changed into another prime (2188913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1094496 + 1094497.

It is an arithmetic number, because the mean of its divisors is an integer number (1094497).

2^2188993 is an apocalyptic number.

It is an amenable number.

2188993 is a deficient number, since it is larger than the sum of its proper divisors (1).

2188993 is an equidigital number, since it uses as much as digits as its factorization.

2188993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 40.

The square root of 2188993 is about 1479.5245858045. The cubic root of 2188993 is about 129.8418787583.

The spelling of 2188993 in words is "two million, one hundred eighty-eight thousand, nine hundred ninety-three".