12157305 has 8 divisors (see below), whose sum is σ = 19451712. Its totient is φ = 6483888.

The previous prime is 12157303. The next prime is 12157307. The reversal of 12157305 is 50375121.

12157305 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (12157303) and next prime (12157307).

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

It is not a de Polignac number, because 12157305 - 2¹ = 12157303 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12157303) 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, 405229 + ... + 405258.

It is an arithmetic number, because the mean of its divisors is an integer number (2431464).

Almost surely, 2^12157305 is an apocalyptic number.

12157305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12157305 is a deficient number, since it is larger than the sum of its proper divisors (7294407).

12157305 is an equidigital number, since it uses as much as digits as its factorization.

12157305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810495.

The product of its (nonzero) digits is 1050, while the sum is 24.

The square root of 12157305 is about 3486.7327112929. The cubic root of 12157305 is about 229.9388936596.

The spelling of 12157305 in words is "twelve million, one hundred fifty-seven thousand, three hundred five".