12157145 has 48 divisors (see below), whose sum is σ = 19994688. Its totient is φ = 6975360.

The previous prime is 12157141. The next prime is 12157147. The reversal of 12157145 is 54175121.

It is not a de Polignac number, because 12157145 - 2² = 12157141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12157141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 34862 + ... + 35208.

It is an arithmetic number, because the mean of its divisors is an integer number (416556).

Almost surely, 2^12157145 is an apocalyptic number.

It is an amenable number.

12157145 is a deficient number, since it is larger than the sum of its proper divisors (7837543).

12157145 is a wasteful number, since it uses less digits than its factorization.

12157145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390 (or 383 counting only the distinct ones).

The product of its digits is 1400, while the sum is 26.

The square root of 12157145 is about 3486.7097671014. The cubic root of 12157145 is about 229.9378849277.

The spelling of 12157145 in words is "twelve million, one hundred fifty-seven thousand, one hundred forty-five".