1311404 has 6 divisors (see below), whose sum is σ = 2294964. Its totient is φ = 655700.

The previous prime is 1311403. The next prime is 1311407. The reversal of 1311404 is 4041131.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1311403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 163922 + ... + 163929.

It is an arithmetic number, because the mean of its divisors is an integer number (382494).

2^1311404 is an apocalyptic number.

It is an amenable number.

1311404 is a deficient number, since it is larger than the sum of its proper divisors (983560).

1311404 is a wasteful number, since it uses less digits than its factorization.

1311404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327855 (or 327853 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 1311404 is about 1145.1654902240. The cubic root of 1311404 is about 109.4574941184.

Subtracting from 1311404 its sum of digits (14), we obtain a triangular number (1311390 = T₁₆₁₉).

Adding to 1311404 its reverse (4041131), we get a palindrome (5352535).

The spelling of 1311404 in words is "one million, three hundred eleven thousand, four hundred four".