23781949 has 2 divisors, whose sum is σ = 23781950. Its totient is φ = 23781948.

The previous prime is 23781937. The next prime is 23781971. The reversal of 23781949 is 94918732.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17935225 + 5846724 = 4235^2 + 2418^2 .

It is a cyclic number.

It is not a de Polignac number, because 23781949 - 2⁹ = 23781437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23781049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11890974 + 11890975.

It is an arithmetic number, because the mean of its divisors is an integer number (11890975).

Almost surely, 2^23781949 is an apocalyptic number.

It is an amenable number.

23781949 is a deficient number, since it is larger than the sum of its proper divisors (1).

23781949 is an equidigital number, since it uses as much as digits as its factorization.

23781949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 43.

The square root of 23781949 is about 4876.6739690080. The cubic root of 23781949 is about 287.5736884839.

The spelling of 23781949 in words is "twenty-three million, seven hundred eighty-one thousand, nine hundred forty-nine".