12978324 has 18 divisors (see below), whose sum is σ = 32806410. Its totient is φ = 4326096.

The previous prime is 12978323. The next prime is 12978331. The reversal of 12978324 is 42387921.

It can be written as a sum of positive squares in only one way, i.e., 8643600 + 4334724 = 2940^2 + 2082^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 360509 = 12978324 / (1 + 2 + 9 + 7 + 8 + 3 + 2 + 4).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12978323) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 180219 + ... + 180290.

Almost surely, 2^12978324 is an apocalyptic number.

It is an amenable number.

12978324 is an abundant number, since it is smaller than the sum of its proper divisors (19828086).

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

12978324 is a wasteful number, since it uses less digits than its factorization.

12978324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360519 (or 360514 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 12978324 is about 3602.5441010486. The cubic root of 12978324 is about 235.0027100940.

The spelling of 12978324 in words is "twelve million, nine hundred seventy-eight thousand, three hundred twenty-four".