1799823985 has 4 divisors (see below), whose sum is σ = 2159788788. Its totient is φ = 1439859184.

The previous prime is 1799823929. The next prime is 1799823989. The reversal of 1799823985 is 5893289971.

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 932874849 + 866949136 = 30543^2 + 29444^2 .

It is a cyclic number.

It is not a de Polignac number, because 1799823985 - 2²³ = 1791435377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1799823989) 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, 179982394 + ... + 179982403.

It is an arithmetic number, because the mean of its divisors is an integer number (539947197).

Almost surely, 2^1799823985 is an apocalyptic number.

It is an amenable number.

1799823985 is a deficient number, since it is larger than the sum of its proper divisors (359964803).

1799823985 is an equidigital number, since it uses as much as digits as its factorization.

1799823985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359964802.

The product of its digits is 9797760, while the sum is 61.

The square root of 1799823985 is about 42424.3324638114. The cubic root of 1799823985 is about 1216.4007474969.

The spelling of 1799823985 in words is "one billion, seven hundred ninety-nine million, eight hundred twenty-three thousand, nine hundred eighty-five".