12978458 has 8 divisors (see below), whose sum is σ = 19649952. Its totient is φ = 6428476.

The previous prime is 12978431. The next prime is 12978467. The reversal of 12978458 is 85487921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30110 + ... + 30537.

It is an arithmetic number, because the mean of its divisors is an integer number (2456244).

Almost surely, 2^12978458 is an apocalyptic number.

12978458 is a deficient number, since it is larger than the sum of its proper divisors (6671494).

12978458 is a wasteful number, since it uses less digits than its factorization.

12978458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60756.

The product of its digits is 161280, while the sum is 44.

The square root of 12978458 is about 3602.5626989686. The cubic root of 12978458 is about 235.0035188850.

It can be divided in two parts, 129 and 78458, that added together give a palindrome (78587).

The spelling of 12978458 in words is "twelve million, nine hundred seventy-eight thousand, four hundred fifty-eight".