12506978 has 16 divisors (see below), whose sum is σ = 21543840. Its totient is φ = 5385600.

The previous prime is 12506969. The next prime is 12506983. The reversal of 12506978 is 87960521.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14543 + ... + 15378.

It is an arithmetic number, because the mean of its divisors is an integer number (1346490).

Almost surely, 2^12506978 is an apocalyptic number.

12506978 is a deficient number, since it is larger than the sum of its proper divisors (9036862).

12506978 is a wasteful number, since it uses less digits than its factorization.

12506978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29953.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 12506978 is about 3536.5206064718. The cubic root of 12506978 is about 232.1226189897.

It can be divided in two parts, 1250 and 6978, that added together give a palindrome (8228).

The spelling of 12506978 in words is "twelve million, five hundred six thousand, nine hundred seventy-eight".