23981257 has 4 divisors (see below), whose sum is σ = 24052756. Its totient is φ = 23909760.

The previous prime is 23981227. The next prime is 23981263. The reversal of 23981257 is 75218932.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11703241 + 12278016 = 3421^2 + 3504^2 .

It is a cyclic number.

It is not a de Polignac number, because 23981257 - 2¹¹ = 23979209 is a prime.

It is a super-3 number, since 3×23981257³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23981207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35244 + ... + 35917.

It is an arithmetic number, because the mean of its divisors is an integer number (6013189).

Almost surely, 2^23981257 is an apocalyptic number.

It is an amenable number.

23981257 is a deficient number, since it is larger than the sum of its proper divisors (71499).

23981257 is an equidigital number, since it uses as much as digits as its factorization.

23981257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71498.

The product of its digits is 30240, while the sum is 37.

The square root of 23981257 is about 4897.0661625100. The cubic root of 23981257 is about 288.3748053845.

It can be divided in two parts, 2398 and 1257, that added together give a triangular number (3655 = T₈₅).

The spelling of 23981257 in words is "twenty-three million, nine hundred eighty-one thousand, two hundred fifty-seven".