1311642 has 12 divisors (see below), whose sum is σ = 2841930. Its totient is φ = 437208.

The previous prime is 1311623. The next prime is 1311643. The reversal of 1311642 is 2461131.

It is a happy number.

1311642 is a `hidden beast` number, since 13 + 11 + 642 = 666.

It can be written as a sum of positive squares in only one way, i.e., 962361 + 349281 = 981^2 + 591^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 72869 = 1311642 / (1 + 3 + 1 + 1 + 6 + 4 + 2).

It is not an unprimeable number, because it can be changed into a prime (1311643) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36417 + ... + 36452.

2^1311642 is an apocalyptic number.

1311642 is an abundant number, since it is smaller than the sum of its proper divisors (1530288).

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

1311642 is a wasteful number, since it uses less digits than its factorization.

1311642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72877 (or 72874 counting only the distinct ones).

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

The square root of 1311642 is about 1145.2694006215. The cubic root of 1311642 is about 109.4641153447.

Adding to 1311642 its reverse (2461131), we get a palindrome (3772773).

It can be divided in two parts, 1311 and 642, that added together give a triangular number (1953 = T₆₂).

The spelling of 1311642 in words is "one million, three hundred eleven thousand, six hundred forty-two".