12781380 has 24 divisors (see below), whose sum is σ = 35788032. Its totient is φ = 3408352.

The previous prime is 12781367. The next prime is 12781411. The reversal of 12781380 is 8318721.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 106452 + ... + 106571.

It is an arithmetic number, because the mean of its divisors is an integer number (1491168).

Almost surely, 2^12781380 is an apocalyptic number.

12781380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12781380 is an abundant number, since it is smaller than the sum of its proper divisors (23006652).

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

12781380 is a wasteful number, since it uses less digits than its factorization.

12781380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213035 (or 213033 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 12781380 is about 3575.1055928462. The cubic root of 12781380 is about 233.8079364906.

The spelling of 12781380 in words is "twelve million, seven hundred eighty-one thousand, three hundred eighty".