2193813 has 12 divisors (see below), whose sum is σ = 3189420. Its totient is φ = 1453056.

The previous prime is 2193803. The next prime is 2193827. The reversal of 2193813 is 3183912.

2193813 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 2 ways, for example, as 887364 + 1306449 = 942^2 + 1143^2 .

It is not a de Polignac number, because 2193813 - 2⁶ = 2193749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2193803) 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 11 ways as a sum of consecutive naturals, for example, 853 + ... + 2261.

It is an arithmetic number, because the mean of its divisors is an integer number (265785).

2^2193813 is an apocalyptic number.

It is an amenable number.

2193813 is a deficient number, since it is larger than the sum of its proper divisors (995607).

2193813 is a wasteful number, since it uses less digits than its factorization.

2193813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1588 (or 1585 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 2193813 is about 1481.1525917339. The cubic root of 2193813 is about 129.9371096197.

Subtracting 2193813 from its reverse (3183912), we obtain a palindrome (990099).

The spelling of 2193813 in words is "two million, one hundred ninety-three thousand, eight hundred thirteen".