12199657 has 4 divisors (see below), whose sum is σ = 12209536. Its totient is φ = 12189780.

The previous prime is 12199643. The next prime is 12199669. The reversal of 12199657 is 75699121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 75699121 = 5779 ⋅13099.

It is a cyclic number.

It is not a de Polignac number, because 12199657 - 2¹¹ = 12197609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12199697) 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 3 ways as a sum of consecutive naturals, for example, 2769 + ... + 5662.

It is an arithmetic number, because the mean of its divisors is an integer number (3052384).

Almost surely, 2^12199657 is an apocalyptic number.

It is an amenable number.

12199657 is a deficient number, since it is larger than the sum of its proper divisors (9879).

12199657 is an equidigital number, since it uses as much as digits as its factorization.

12199657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9878.

The product of its digits is 34020, while the sum is 40.

The square root of 12199657 is about 3492.8007386623. The cubic root of 12199657 is about 230.2055943647.

The spelling of 12199657 in words is "twelve million, one hundred ninety-nine thousand, six hundred fifty-seven".