1381312 has 28 divisors (see below), whose sum is σ = 2779776. Its totient is φ = 680960.

The previous prime is 1381307. The next prime is 1381313. The reversal of 1381312 is 2131831.

It is a self number, because there is not a number n which added to its sum of digits gives 1381312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7137 + ... + 7327.

2^1381312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1381312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1389888).

1381312 is an abundant number, since it is smaller than the sum of its proper divisors (1398464).

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

1381312 is a wasteful number, since it uses less digits than its factorization.

1381312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316 (or 306 counting only the distinct ones).

The product of its digits is 144, while the sum is 19.

The square root of 1381312 is about 1175.2923040674. The cubic root of 1381312 is about 111.3688995178.

The spelling of 1381312 in words is "one million, three hundred eighty-one thousand, three hundred twelve".