23985157 has 6 divisors (see below), whose sum is σ = 27901158. Its totient is φ = 20558664.

The previous prime is 23985151. The next prime is 23985161. The reversal of 23985157 is 75158932.

It can be written as a sum of positive squares in only one way, i.e., 19633761 + 4351396 = 4431^2 + 2086^2 .

It is not a de Polignac number, because 23985157 - 2¹¹ = 23983109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23985151) 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, 244698 + ... + 244795.

It is an arithmetic number, because the mean of its divisors is an integer number (4650193).

Almost surely, 2^23985157 is an apocalyptic number.

It is an amenable number.

23985157 is a deficient number, since it is larger than the sum of its proper divisors (3916001).

23985157 is an equidigital number, since it uses as much as digits as its factorization.

23985157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489507 (or 489500 counting only the distinct ones).

The product of its digits is 75600, while the sum is 40.

The square root of 23985157 is about 4897.4643439233. The cubic root of 23985157 is about 288.3904370474.

It can be divided in two parts, 23985 and 157, that added together give a palindrome (24142).

The spelling of 23985157 in words is "twenty-three million, nine hundred eighty-five thousand, one hundred fifty-seven".