1920005 has 4 divisors (see below), whose sum is σ = 2304012. Its totient is φ = 1536000.

The previous prime is 1920001. The next prime is 1920011. The reversal of 1920005 is 5000291.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1331716 + 588289 = 1154^2 + 767^2 .

It is not a de Polignac number, because 1920005 - 2² = 1920001 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1920001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191996 + ... + 192005.

It is an arithmetic number, because the mean of its divisors is an integer number (576003).

2^1920005 is an apocalyptic number.

It is an amenable number.

1920005 is a deficient number, since it is larger than the sum of its proper divisors (384007).

1920005 is an equidigital number, since it uses as much as digits as its factorization.

1920005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384006.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 1920005 is about 1385.6424502735. The cubic root of 1920005 is about 124.2894081281.

Adding to 1920005 its reverse (5000291), we get a palindrome (6920296).

The spelling of 1920005 in words is "one million, nine hundred twenty thousand, five".