12381157 has 4 divisors (see below), whose sum is σ = 12390700. Its totient is φ = 12371616.

The previous prime is 12381113. The next prime is 12381167. The reversal of 12381157 is 75118321.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 2452356 + 9928801 = 1566^2 + 3151^2 .

It is a cyclic number.

It is not a de Polignac number, because 12381157 - 2⁷ = 12381029 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 (12381167) 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, 2448 + ... + 5545.

It is an arithmetic number, because the mean of its divisors is an integer number (3097675).

Almost surely, 2^12381157 is an apocalyptic number.

It is an amenable number.

12381157 is a deficient number, since it is larger than the sum of its proper divisors (9543).

12381157 is an equidigital number, since it uses as much as digits as its factorization.

12381157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9542.

The product of its digits is 1680, while the sum is 28.

The square root of 12381157 is about 3518.6868289179. The cubic root of 12381157 is about 231.3416046138.

Adding to 12381157 its reverse (75118321), we get a palindrome (87499478).

The spelling of 12381157 in words is "twelve million, three hundred eighty-one thousand, one hundred fifty-seven".