1311924 has 48 divisors (see below), whose sum is σ = 3326400. Its totient is φ = 400896.

The previous prime is 1311923. The next prime is 1311967. The reversal of 1311924 is 4291131.

It is a super-2 number, since 2×1311924² = 3442289163552, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1311924.

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 in 15 ways as a sum of consecutive naturals, for example, 11982 + ... + 12090.

It is an arithmetic number, because the mean of its divisors is an integer number (69300).

2^1311924 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 1311924, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1663200).

1311924 is an abundant number, since it is smaller than the sum of its proper divisors (2014476).

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

1311924 is a wasteful number, since it uses less digits than its factorization.

1311924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192 (or 190 counting only the distinct ones).

The product of its digits is 216, while the sum is 21.

The square root of 1311924 is about 1145.3925091426. The cubic root of 1311924 is about 109.4719596265.

The spelling of 1311924 in words is "one million, three hundred eleven thousand, nine hundred twenty-four".