209374836393 has 16 divisors (see below), whose sum is σ = 283388887040. Its totient is φ = 137487820176.

The previous prime is 209374836373. The next prime is 209374836401. The reversal of 209374836393 is 393638473902.

It is a happy number.

It is not a de Polignac number, because 209374836393 - 2⁵ = 209374836361 is a prime.

It is a super-2 number, since 2×209374836393² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (209374836373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1923805 + ... + 2029722.

It is an arithmetic number, because the mean of its divisors is an integer number (17711805440).

Almost surely, 2^209374836393 is an apocalyptic number.

It is an amenable number.

209374836393 is a deficient number, since it is larger than the sum of its proper divisors (74014050647).

209374836393 is a wasteful number, since it uses less digits than its factorization.

209374836393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3953796.

The product of its (nonzero) digits is 17635968, while the sum is 57.

The spelling of 209374836393 in words is "two hundred nine billion, three hundred seventy-four million, eight hundred thirty-six thousand, three hundred ninety-three".