1311992 has 32 divisors (see below), whose sum is σ = 2844720. Its totient is φ = 560640.

The previous prime is 1311991. The next prime is 1312001. The reversal of 1311992 is 2991131.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1058 + ... + 1934.

2^1311992 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 1311992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1422360).

1311992 is an abundant number, since it is smaller than the sum of its proper divisors (1532728).

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

1311992 is a wasteful number, since it uses less digits than its factorization.

1311992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 911 (or 907 counting only the distinct ones).

The product of its digits is 486, while the sum is 26.

The square root of 1311992 is about 1145.4221929053. The cubic root of 1311992 is about 109.4738509872.

The spelling of 1311992 in words is "one million, three hundred eleven thousand, nine hundred ninety-two".