23749987 has 2 divisors, whose sum is σ = 23749988. Its totient is φ = 23749986.

The previous prime is 23749963. The next prime is 23749991. The reversal of 23749987 is 78994732.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23749987 - 2¹⁵ = 23717219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23749987.

It is not a weakly prime, because it can be changed into another prime (23749387) 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, 11874993 + 11874994.

It is an arithmetic number, because the mean of its divisors is an integer number (11874994).

Almost surely, 2^23749987 is an apocalyptic number.

23749987 is a deficient number, since it is larger than the sum of its proper divisors (1).

23749987 is an equidigital number, since it uses as much as digits as its factorization.

23749987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 762048, while the sum is 49.

The square root of 23749987 is about 4873.3958386324. The cubic root of 23749987 is about 287.4448015012. Note that the first 3 decimals are identical.

The spelling of 23749987 in words is "twenty-three million, seven hundred forty-nine thousand, nine hundred eighty-seven".