23856813 has 6 divisors (see below), whose sum is σ = 34459854. Its totient is φ = 15904536.

The previous prime is 23856809. The next prime is 23856817. The reversal of 23856813 is 31865832.

It is an interprime number because it is at equal distance from previous prime (23856809) and next prime (23856817).

It can be written as a sum of positive squares in only one way, i.e., 20766249 + 3090564 = 4557^2 + 1758^2 .

It is not a de Polignac number, because 23856813 - 2² = 23856809 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23856817) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1325370 + ... + 1325387.

It is an arithmetic number, because the mean of its divisors is an integer number (5743309).

Almost surely, 2^23856813 is an apocalyptic number.

It is an amenable number.

23856813 is a deficient number, since it is larger than the sum of its proper divisors (10603041).

23856813 is a wasteful number, since it uses less digits than its factorization.

23856813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2650763 (or 2650760 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 23856813 is about 4884.3436611279. The cubic root of 23856813 is about 287.8751267092.

Subtracting from 23856813 its product of digits (34560), we obtain a triangular number (23822253 = T₆₉₀₂).

The spelling of 23856813 in words is "twenty-three million, eight hundred fifty-six thousand, eight hundred thirteen".