12581978 has 8 divisors (see below), whose sum is σ = 18898272. Its totient is φ = 6282556.

The previous prime is 12581977. The next prime is 12581983. The reversal of 12581978 is 87918521.

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

It is not an unprimeable number, because it can be changed into a prime (12581977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2150 + ... + 5457.

It is an arithmetic number, because the mean of its divisors is an integer number (2362284).

Almost surely, 2^12581978 is an apocalyptic number.

12581978 is a deficient number, since it is larger than the sum of its proper divisors (6316294).

12581978 is an equidigital number, since it uses as much as digits as its factorization.

12581978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8436.

The product of its digits is 40320, while the sum is 41.

The square root of 12581978 is about 3547.1083998096. The cubic root of 12581978 is about 232.5856808348.

The spelling of 12581978 in words is "twelve million, five hundred eighty-one thousand, nine hundred seventy-eight".