1920813 has 8 divisors (see below), whose sum is σ = 2711808. Its totient is φ = 1205184.

The previous prime is 1920811. The next prime is 1920817. The reversal of 1920813 is 3180291.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1920813 - 2¹ = 1920811 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1920811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18781 + ... + 18882.

It is an arithmetic number, because the mean of its divisors is an integer number (338976).

2^1920813 is an apocalyptic number.

It is an amenable number.

1920813 is a deficient number, since it is larger than the sum of its proper divisors (790995).

1920813 is a wasteful number, since it uses less digits than its factorization.

1920813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37683.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 1920813 is about 1385.9339811117. The cubic root of 1920813 is about 124.3068406795.

The spelling of 1920813 in words is "one million, nine hundred twenty thousand, eight hundred thirteen".