1320813 has 32 divisors (see below), whose sum is σ = 2177280. Its totient is φ = 786240.

The previous prime is 1320811. The next prime is 1320859. The reversal of 1320813 is 3180231.

It is not a de Polignac number, because 1320813 - 2¹ = 1320811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18568 + ... + 18638.

It is an arithmetic number, because the mean of its divisors is an integer number (68040).

2^1320813 is an apocalyptic number.

1320813 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1320813 is a deficient number, since it is larger than the sum of its proper divisors (856467).

1320813 is a wasteful number, since it uses less digits than its factorization.

1320813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146 (or 140 counting only the distinct ones).

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

The square root of 1320813 is about 1149.2662876810. The cubic root of 1320813 is about 109.7186473747.

The spelling of 1320813 in words is "one million, three hundred twenty thousand, eight hundred thirteen".