23781136 has 10 divisors (see below), whose sum is σ = 46075982. Its totient is φ = 11890560.

The previous prime is 23781127. The next prime is 23781139. The reversal of 23781136 is 63118732.

It can be written as a sum of positive squares in only one way, i.e., 19184400 + 4596736 = 4380^2 + 2144^2 .

It is a junction number, because it is equal to n+sod(n) for n = 23781098 and 23781107.

It is not an unprimeable number, because it can be changed into a prime (23781139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 743145 + ... + 743176.

Almost surely, 2^23781136 is an apocalyptic number.

It is an amenable number.

23781136 is a deficient number, since it is larger than the sum of its proper divisors (22294846).

23781136 is a wasteful number, since it uses less digits than its factorization.

23781136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1486329 (or 1486323 counting only the distinct ones).

The product of its digits is 6048, while the sum is 31.

The square root of 23781136 is about 4876.5906123028. The cubic root of 23781136 is about 287.5704114876.

Adding to 23781136 its reverse (63118732), we get a palindrome (86899868).

The spelling of 23781136 in words is "twenty-three million, seven hundred eighty-one thousand, one hundred thirty-six".