12219657 has 16 divisors (see below), whose sum is σ = 16835520. Its totient is φ = 7877952.

The previous prime is 12219653. The next prime is 12219659. The reversal of 12219657 is 75691221.

12219657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12219657 - 2² = 12219653 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12219653) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31219 + ... + 31607.

It is an arithmetic number, because the mean of its divisors is an integer number (1052220).

Almost surely, 2^12219657 is an apocalyptic number.

It is an amenable number.

12219657 is a deficient number, since it is larger than the sum of its proper divisors (4615863).

12219657 is a wasteful number, since it uses less digits than its factorization.

12219657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712.

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

The square root of 12219657 is about 3495.6625981350. The cubic root of 12219657 is about 230.3313246262.

It can be divided in two parts, 1221 and 9657, that added together give a triangular number (10878 = T₁₄₇).

The spelling of 12219657 in words is "twelve million, two hundred nineteen thousand, six hundred fifty-seven".