1992805 has 8 divisors (see below), whose sum is σ = 2449944. Its totient is φ = 1555200.

The previous prime is 1992803. The next prime is 1992817. The reversal of 1992805 is 5082991.

It can be written as a sum of positive squares in 4 ways, for example, as 145924 + 1846881 = 382^2 + 1359^2 .

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

It is not a de Polignac number, because 1992805 - 2¹ = 1992803 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 (1992803) 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 7 ways as a sum of consecutive naturals, for example, 4656 + ... + 5065.

It is an arithmetic number, because the mean of its divisors is an integer number (306243).

2^1992805 is an apocalyptic number.

It is an amenable number.

1992805 is a deficient number, since it is larger than the sum of its proper divisors (457139).

1992805 is an equidigital number, since it uses as much as digits as its factorization.

1992805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9767.

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 1992805 is about 1411.6674537581. The cubic root of 1992805 is about 125.8408379172.

The spelling of 1992805 in words is "one million, nine hundred ninety-two thousand, eight hundred five".