1312780 has 24 divisors (see below), whose sum is σ = 3151008. Its totient is φ = 450048.

The previous prime is 1312777. The next prime is 1312789. The reversal of 1312780 is 872131.

It is not an unprimeable number, because it can be changed into a prime (1312789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4549 + ... + 4828.

It is an arithmetic number, because the mean of its divisors is an integer number (131292).

2^1312780 is an apocalyptic number.

1312780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1312780 is an abundant number, since it is smaller than the sum of its proper divisors (1838228).

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

1312780 is a wasteful number, since it uses less digits than its factorization.

1312780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9393 (or 9391 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 1312780 is about 1145.7661192407. The cubic root of 1312780 is about 109.4957637554.

The spelling of 1312780 in words is "one million, three hundred twelve thousand, seven hundred eighty".