12309157 has 8 divisors (see below), whose sum is σ = 14129856. Its totient is φ = 10504032.

The previous prime is 12309133. The next prime is 12309179. The reversal of 12309157 is 75190321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12309157 - 2⁷ = 12309029 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 (12309457) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2143 + ... + 5404.

It is an arithmetic number, because the mean of its divisors is an integer number (1766232).

Almost surely, 2^12309157 is an apocalyptic number.

It is an amenable number.

12309157 is a deficient number, since it is larger than the sum of its proper divisors (1820699).

12309157 is an equidigital number, since it uses as much as digits as its factorization.

12309157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7787.

The product of its (nonzero) digits is 1890, while the sum is 28.

The square root of 12309157 is about 3508.4408217896. The cubic root of 12309157 is about 230.8922931349.

Adding to 12309157 its reverse (75190321), we get a palindrome (87499478).

The spelling of 12309157 in words is "twelve million, three hundred nine thousand, one hundred fifty-seven".