23781213 has 6 divisors (see below), whose sum is σ = 34350654. Its totient is φ = 15854136.

The previous prime is 23781203. The next prime is 23781221. The reversal of 23781213 is 31218732.

It can be written as a sum of positive squares in only one way, i.e., 13264164 + 10517049 = 3642^2 + 3243^2 .

It is not a de Polignac number, because 23781213 - 2¹⁰ = 23780189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23781203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1321170 + ... + 1321187.

It is an arithmetic number, because the mean of its divisors is an integer number (5725109).

Almost surely, 2^23781213 is an apocalyptic number.

It is an amenable number.

23781213 is a deficient number, since it is larger than the sum of its proper divisors (10569441).

23781213 is a wasteful number, since it uses less digits than its factorization.

23781213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2642363 (or 2642360 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 23781213 is about 4876.5985071564. The cubic root of 23781213 is about 287.5707218582.

Adding to 23781213 its reverse (31218732), we get a palindrome (54999945).

The spelling of 23781213 in words is "twenty-three million, seven hundred eighty-one thousand, two hundred thirteen".