23699857 has 2 divisors, whose sum is σ = 23699858. Its totient is φ = 23699856.

The previous prime is 23699839. The next prime is 23699881. The reversal of 23699857 is 75899632.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12383361 + 11316496 = 3519^2 + 3364^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23699857 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23699857.

It is not a weakly prime, because it can be changed into another prime (23699257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11849928 + 11849929.

It is an arithmetic number, because the mean of its divisors is an integer number (11849929).

Almost surely, 2^23699857 is an apocalyptic number.

It is an amenable number.

23699857 is a deficient number, since it is larger than the sum of its proper divisors (1).

23699857 is an equidigital number, since it uses as much as digits as its factorization.

23699857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 49.

The square root of 23699857 is about 4868.2498908745. The cubic root of 23699857 is about 287.2424188205.

The spelling of 23699857 in words is "twenty-three million, six hundred ninety-nine thousand, eight hundred fifty-seven".