1312380 has 72 divisors (see below), whose sum is σ = 4167072. Its totient is φ = 333696.

The previous prime is 1312379. The next prime is 1312391. The reversal of 1312380 is 832131.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3982 + ... + 4298.

It is an arithmetic number, because the mean of its divisors is an integer number (57876).

2^1312380 is an apocalyptic number.

1312380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1312380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2083536).

1312380 is an abundant number, since it is smaller than the sum of its proper divisors (2854692).

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

1312380 is a wasteful number, since it uses less digits than its factorization.

1312380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355 (or 350 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1312380 is about 1145.5915502482. The cubic root of 1312380 is about 109.4846416190.

Subtracting from 1312380 its reverse (832131), we obtain a square (480249 = 693²).

It can be divided in two parts, 13123 and 80, that added together give a triangular number (13203 = T₁₆₂).

The spelling of 1312380 in words is "one million, three hundred twelve thousand, three hundred eighty".