23009857 has 12 divisors (see below), whose sum is σ = 26384940. Its totient is φ = 19987968.

The previous prime is 23009839. The next prime is 23009873. The reversal of 23009857 is 75890032.

It can be written as a sum of positive squares in 6 ways, for example, as 646416 + 22363441 = 804^2 + 4729^2 .

It is a de Polignac number, because none of the positive numbers 2^k-23009857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23009807) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1132 + ... + 6877.

It is an arithmetic number, because the mean of its divisors is an integer number (2198745).

Almost surely, 2^23009857 is an apocalyptic number.

It is an amenable number.

23009857 is a deficient number, since it is larger than the sum of its proper divisors (3375083).

23009857 is a wasteful number, since it uses less digits than its factorization.

23009857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8052 (or 8039 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 23009857 is about 4796.8590765208. The cubic root of 23009857 is about 284.4273182652.

Adding to 23009857 its reverse (75890032), we get a palindrome (98899889).

The spelling of 23009857 in words is "twenty-three million, nine thousand, eight hundred fifty-seven".