2193409 has 4 divisors (see below), whose sum is σ = 2196400. Its totient is φ = 2190420.

The previous prime is 2193383. The next prime is 2193413. The reversal of 2193409 is 9043912.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2193409 - 2¹⁹ = 1669121 is a prime.

It is a super-2 number, since 2×2193409² = 9622086082562, which contains 22 as substring.

It is a Duffinian number.

2193409 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2193419) 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, 442 + ... + 2140.

It is an arithmetic number, because the mean of its divisors is an integer number (549100).

It is a Proth number, since it is equal to 1071 ⋅ 2¹¹ + 1 and 1071 < 2¹¹.

2^2193409 is an apocalyptic number.

It is an amenable number.

2193409 is a deficient number, since it is larger than the sum of its proper divisors (2991).

2193409 is a wasteful number, since it uses less digits than its factorization.

2193409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2990.

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

The square root of 2193409 is about 1481.0162051781. The cubic root of 2193409 is about 129.9291329728.

The spelling of 2193409 in words is "two million, one hundred ninety-three thousand, four hundred nine".