12723978 has 16 divisors (see below), whose sum is σ = 25499520. Its totient is φ = 4232736.

The previous prime is 12723959. The next prime is 12723979. The reversal of 12723978 is 87932721.

It is a super-2 number, since 2×12723978² = 323799232288968, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12723979) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1551 + ... + 5277.

It is an arithmetic number, because the mean of its divisors is an integer number (1593720).

Almost surely, 2^12723978 is an apocalyptic number.

12723978 is an abundant number, since it is smaller than the sum of its proper divisors (12775542).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12723978 is a wasteful number, since it uses less digits than its factorization.

12723978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4301.

The product of its digits is 42336, while the sum is 39.

The square root of 12723978 is about 3567.0685443372. The cubic root of 12723978 is about 233.4573957029.

The spelling of 12723978 in words is "twelve million, seven hundred twenty-three thousand, nine hundred seventy-eight".