23987129 has 2 divisors, whose sum is σ = 23987130. Its totient is φ = 23987128.

The previous prime is 23987081. The next prime is 23987167. The reversal of 23987129 is 92178932.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23863225 + 123904 = 4885^2 + 352^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23987129 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (23987179) 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, 11993564 + 11993565.

It is an arithmetic number, because the mean of its divisors is an integer number (11993565).

Almost surely, 2^23987129 is an apocalyptic number.

It is an amenable number.

23987129 is a deficient number, since it is larger than the sum of its proper divisors (1).

23987129 is an equidigital number, since it uses as much as digits as its factorization.

23987129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 41.

The square root of 23987129 is about 4897.6656684588. The cubic root of 23987129 is about 288.3983404125.

It can be divided in two parts, 239 and 87129, that multiplied together give a triangular number (20823831 = T₆₄₅₃).

The spelling of 23987129 in words is "twenty-three million, nine hundred eighty-seven thousand, one hundred twenty-nine".