23781349 has 2 divisors, whose sum is σ = 23781350. Its totient is φ = 23781348.

The previous prime is 23781341. The next prime is 23781367. The reversal of 23781349 is 94318732.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17581249 + 6200100 = 4193^2 + 2490^2 .

It is a cyclic number.

It is not a de Polignac number, because 23781349 - 2³ = 23781341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23781341) 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 as a sum of consecutive naturals, namely, 11890674 + 11890675.

It is an arithmetic number, because the mean of its divisors is an integer number (11890675).

Almost surely, 2^23781349 is an apocalyptic number.

It is an amenable number.

23781349 is a deficient number, since it is larger than the sum of its proper divisors (1).

23781349 is an equidigital number, since it uses as much as digits as its factorization.

23781349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 37.

The square root of 23781349 is about 4876.6124512821. The cubic root of 23781349 is about 287.5712700437.

The spelling of 23781349 in words is "twenty-three million, seven hundred eighty-one thousand, three hundred forty-nine".