12158649 has 6 divisors (see below), whose sum is σ = 17562506. Its totient is φ = 8105760.

The previous prime is 12158617. The next prime is 12158669. The reversal of 12158649 is 94685121.

12158649 is a `hidden beast` number, since 1 + 2 + 1 + 5 + 8 + 649 = 666.

It can be written as a sum of positive squares in only one way, i.e., 9734400 + 2424249 = 3120^2 + 1557^2 .

It is not a de Polignac number, because 12158649 - 2⁵ = 12158617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12158609) 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 5 ways as a sum of consecutive naturals, for example, 675472 + ... + 675489.

Almost surely, 2^12158649 is an apocalyptic number.

It is an amenable number.

12158649 is a deficient number, since it is larger than the sum of its proper divisors (5403857).

12158649 is a wasteful number, since it uses less digits than its factorization.

12158649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1350967 (or 1350964 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 12158649 is about 3486.9254365415. The cubic root of 12158649 is about 229.9473666582.

The spelling of 12158649 in words is "twelve million, one hundred fifty-eight thousand, six hundred forty-nine".