23861993 has 2 divisors, whose sum is σ = 23861994. Its totient is φ = 23861992.

The previous prime is 23861989. The next prime is 23862001. The reversal of 23861993 is 39916832.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19333609 + 4528384 = 4397^2 + 2128^2 .

It is a cyclic number.

It is not a de Polignac number, because 23861993 - 2² = 23861989 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23861993.

It is not a weakly prime, because it can be changed into another prime (23861933) 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, 11930996 + 11930997.

It is an arithmetic number, because the mean of its divisors is an integer number (11930997).

Almost surely, 2^23861993 is an apocalyptic number.

It is an amenable number.

23861993 is a deficient number, since it is larger than the sum of its proper divisors (1).

23861993 is an equidigital number, since it uses as much as digits as its factorization.

23861993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 41.

The square root of 23861993 is about 4884.8738980653. The cubic root of 23861993 is about 287.8959605236.

The spelling of 23861993 in words is "twenty-three million, eight hundred sixty-one thousand, nine hundred ninety-three".