13212378 has 12 divisors (see below), whose sum is σ = 28626858. Its totient is φ = 4404120.

The previous prime is 13212377. The next prime is 13212403. The reversal of 13212378 is 87321231.

It can be written as a sum of positive squares in only one way, i.e., 13198689 + 13689 = 3633^2 + 117^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13212377) 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 5 ways as a sum of consecutive naturals, for example, 366993 + ... + 367028.

Almost surely, 2^13212378 is an apocalyptic number.

13212378 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

13212378 is an abundant number, since it is smaller than the sum of its proper divisors (15414480).

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

13212378 is a wasteful number, since it uses less digits than its factorization.

13212378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 734029 (or 734026 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 13212378 is about 3634.8834919430. The cubic root of 13212378 is about 236.4069990284.

The spelling of 13212378 in words is "thirteen million, two hundred twelve thousand, three hundred seventy-eight".