2190943 has 4 divisors (see below), whose sum is σ = 2319840. Its totient is φ = 2062048.

The previous prime is 2190901. The next prime is 2190959. The reversal of 2190943 is 3490912.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2190943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2190983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64423 + ... + 64456.

It is an arithmetic number, because the mean of its divisors is an integer number (579960).

2^2190943 is an apocalyptic number.

2190943 is a deficient number, since it is larger than the sum of its proper divisors (128897).

2190943 is a wasteful number, since it uses less digits than its factorization.

2190943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128896.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 2190943 is about 1480.1834345783. The cubic root of 2190943 is about 129.8804225877.

It can be divided in two parts, 21909 and 43, that added together give a cube (21952 = 28³).

The spelling of 2190943 in words is "two million, one hundred ninety thousand, nine hundred forty-three".