12391280 has 40 divisors (see below), whose sum is σ = 31431024. Its totient is φ = 4505600.

The previous prime is 12391261. The next prime is 12391297. The reversal of 12391280 is 8219321.

12391280 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6161 + ... + 7920.

Almost surely, 2^12391280 is an apocalyptic number.

12391280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12391280 is an abundant number, since it is smaller than the sum of its proper divisors (19039744).

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

12391280 is a wasteful number, since it uses less digits than its factorization.

12391280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14105 (or 14099 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 12391280 is about 3520.1249977806. The cubic root of 12391280 is about 231.4046367711.

The spelling of 12391280 in words is "twelve million, three hundred ninety-one thousand, two hundred eighty".