1311928 has 8 divisors (see below), whose sum is σ = 2459880. Its totient is φ = 655960.

The previous prime is 1311923. The next prime is 1311967. The reversal of 1311928 is 8291131.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311923) 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, 81988 + ... + 82003.

It is an arithmetic number, because the mean of its divisors is an integer number (307485).

2^1311928 is an apocalyptic number.

It is an amenable number.

1311928 is a deficient number, since it is larger than the sum of its proper divisors (1147952).

1311928 is a wasteful number, since it uses less digits than its factorization.

1311928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163997 (or 163993 counting only the distinct ones).

The product of its digits is 432, while the sum is 25.

The square root of 1311928 is about 1145.3942552676. The cubic root of 1311928 is about 109.4720708848.

The spelling of 1311928 in words is "one million, three hundred eleven thousand, nine hundred twenty-eight".