1311872 has 32 divisors (see below), whose sum is σ = 2693820. Its totient is φ = 635904.

The previous prime is 1311857. The next prime is 1311899. The reversal of 1311872 is 2781131.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1308736 + 3136 = 1144^2 + 56^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4598 + ... + 4874.

2^1311872 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 1311872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1346910).

1311872 is an abundant number, since it is smaller than the sum of its proper divisors (1381948).

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

1311872 is an equidigital number, since it uses as much as digits as its factorization.

1311872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328 (or 316 counting only the distinct ones).

The product of its digits is 336, while the sum is 23.

The square root of 1311872 is about 1145.3698092756. The cubic root of 1311872 is about 109.4705132477.

The spelling of 1311872 in words is "one million, three hundred eleven thousand, eight hundred seventy-two".