12712978 has 16 divisors (see below), whose sum is σ = 19733400. Its totient is φ = 6137856.

The previous prime is 12712969. The next prime is 12712979. The reversal of 12712978 is 87921721.

It can be written as a sum of positive squares in 4 ways, for example, as 12061729 + 651249 = 3473^2 + 807^2 .

It is a Harshad number since it is a multiple of its sum of digits (37).

It is not an unprimeable number, because it can be changed into a prime (12712979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10450 + ... + 11602.

Almost surely, 2^12712978 is an apocalyptic number.

12712978 is a deficient number, since it is larger than the sum of its proper divisors (7020422).

12712978 is a wasteful number, since it uses less digits than its factorization.

12712978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1341.

The product of its digits is 14112, while the sum is 37.

The square root of 12712978 is about 3565.5263286084. The cubic root of 12712978 is about 233.3901009271.

The spelling of 12712978 in words is "twelve million, seven hundred twelve thousand, nine hundred seventy-eight".