12291657 has 8 divisors (see below), whose sum is σ = 18730176. Its totient is φ = 7023792.

The previous prime is 12291649. The next prime is 12291661. The reversal of 12291657 is 75619221.

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

It is not a de Polignac number, because 12291657 - 2³ = 12291649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12291607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 292638 + ... + 292679.

It is an arithmetic number, because the mean of its divisors is an integer number (2341272).

Almost surely, 2^12291657 is an apocalyptic number.

It is an amenable number.

12291657 is a deficient number, since it is larger than the sum of its proper divisors (6438519).

12291657 is an equidigital number, since it uses as much as digits as its factorization.

12291657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 585327.

The product of its digits is 7560, while the sum is 33.

The square root of 12291657 is about 3505.9459493837. The cubic root of 12291657 is about 230.7828209347.

The spelling of 12291657 in words is "twelve million, two hundred ninety-one thousand, six hundred fifty-seven".