12378280 has 16 divisors (see below), whose sum is σ = 27851220. Its totient is φ = 4951296.

The previous prime is 12378277. The next prime is 12378307. The reversal of 12378280 is 8287321.

It can be written as a sum of positive squares in 2 ways, for example, as 11682724 + 695556 = 3418^2 + 834^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 154689 + ... + 154768.

Almost surely, 2^12378280 is an apocalyptic number.

12378280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12378280 is an abundant number, since it is smaller than the sum of its proper divisors (15472940).

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

12378280 is a wasteful number, since it uses less digits than its factorization.

12378280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309468 (or 309464 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 12378280 is about 3518.2779878799. The cubic root of 12378280 is about 231.3236843350.

The spelling of 12378280 in words is "twelve million, three hundred seventy-eight thousand, two hundred eighty".