12162578 has 4 divisors (see below), whose sum is σ = 18243870. Its totient is φ = 6081288.

The previous prime is 12162559. The next prime is 12162587. The reversal of 12162578 is 87526121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 11580409 + 582169 = 3403^2 + 763^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3040643 + ... + 3040646.

Almost surely, 2^12162578 is an apocalyptic number.

12162578 is a deficient number, since it is larger than the sum of its proper divisors (6081292).

12162578 is an equidigital number, since it uses as much as digits as its factorization.

12162578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6081291.

The product of its digits is 6720, while the sum is 32.

The square root of 12162578 is about 3487.4887813440. The cubic root of 12162578 is about 229.9721327295.

Adding to 12162578 its reverse (87526121), we get a palindrome (99688699).

The spelling of 12162578 in words is "twelve million, one hundred sixty-two thousand, five hundred seventy-eight".