12422978 has 4 divisors (see below), whose sum is σ = 18634470. Its totient is φ = 6211488.

The previous prime is 12422953. The next prime is 12422989. The reversal of 12422978 is 87922421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87922421 = 1117 ⋅78713.

It can be written as a sum of positive squares in only one way, i.e., 12411529 + 11449 = 3523^2 + 107^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 3105743 + ... + 3105746.

Almost surely, 2^12422978 is an apocalyptic number.

12422978 is a deficient number, since it is larger than the sum of its proper divisors (6211492).

12422978 is an equidigital number, since it uses as much as digits as its factorization.

12422978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6211491.

The product of its digits is 16128, while the sum is 35.

The square root of 12422978 is about 3524.6245190091. The cubic root of 12422978 is about 231.6017866611.

The spelling of 12422978 in words is "twelve million, four hundred twenty-two thousand, nine hundred seventy-eight".