12138157 has 2 divisors, whose sum is σ = 12138158. Its totient is φ = 12138156.

The previous prime is 12138151. The next prime is 12138163. The reversal of 12138157 is 75183121.

It is a balanced prime because it is at equal distance from previous prime (12138151) and next prime (12138163).

It can be written as a sum of positive squares in only one way, i.e., 11329956 + 808201 = 3366^2 + 899^2 .

It is a cyclic number.

It is not a de Polignac number, because 12138157 - 2⁷ = 12138029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12138151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6069078 + 6069079.

It is an arithmetic number, because the mean of its divisors is an integer number (6069079).

Almost surely, 2^12138157 is an apocalyptic number.

It is an amenable number.

12138157 is a deficient number, since it is larger than the sum of its proper divisors (1).

12138157 is an equidigital number, since it uses as much as digits as its factorization.

12138157 is an evil number, because the sum of its binary digits is even.

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

The square root of 12138157 is about 3483.9857921639. The cubic root of 12138157 is about 229.8181107641.

The spelling of 12138157 in words is "twelve million, one hundred thirty-eight thousand, one hundred fifty-seven".