2194309 has 8 divisors (see below), whose sum is σ = 2502360. Its totient is φ = 1906176.

The previous prime is 2194301. The next prime is 2194319. The reversal of 2194309 is 9034912.

It is a happy number.

2194309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 77284 + 2117025 = 278^2 + 1455^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2194309 - 2³ = 2194301 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 (2194301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4744 + ... + 5185.

It is an arithmetic number, because the mean of its divisors is an integer number (312795).

2^2194309 is an apocalyptic number.

It is an amenable number.

2194309 is a deficient number, since it is larger than the sum of its proper divisors (308051).

2194309 is a wasteful number, since it uses less digits than its factorization.

2194309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9959.

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

The square root of 2194309 is about 1481.3200194421. The cubic root of 2194309 is about 129.9469013917.

The spelling of 2194309 in words is "two million, one hundred ninety-four thousand, three hundred nine".