23185639 has 2 divisors, whose sum is σ = 23185640. Its totient is φ = 23185638.

The previous prime is 23185621. The next prime is 23185649. The reversal of 23185639 is 93658132.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23185639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 23185598 and 23185607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23185649) 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, 11592819 + 11592820.

It is an arithmetic number, because the mean of its divisors is an integer number (11592820).

Almost surely, 2^23185639 is an apocalyptic number.

23185639 is a deficient number, since it is larger than the sum of its proper divisors (1).

23185639 is an equidigital number, since it uses as much as digits as its factorization.

23185639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 37.

The square root of 23185639 is about 4815.1468305754. The cubic root of 23185639 is about 285.1497684149.

The spelling of 23185639 in words is "twenty-three million, one hundred eighty-five thousand, six hundred thirty-nine".