12491078 has 24 divisors (see below), whose sum is σ = 19852056. Its totient is φ = 5892480.

The previous prime is 12491071. The next prime is 12491131. The reversal of 12491078 is 87019421.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12491071) 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 11 ways as a sum of consecutive naturals, for example, 128726 + ... + 128822.

It is an arithmetic number, because the mean of its divisors is an integer number (827169).

Almost surely, 2^12491078 is an apocalyptic number.

12491078 is a deficient number, since it is larger than the sum of its proper divisors (7360978).

12491078 is an equidigital number, since it uses as much as digits as its factorization.

12491078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228 (or 197 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 12491078 is about 3534.2719193633. The cubic root of 12491078 is about 232.0242121976.

The spelling of 12491078 in words is "twelve million, four hundred ninety-one thousand, seventy-eight".