1985099 has 4 divisors (see below), whose sum is σ = 1988136. Its totient is φ = 1982064.

The previous prime is 1985077. The next prime is 1985167. The reversal of 1985099 is 9905891.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1985099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1981099) 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 3 ways as a sum of consecutive naturals, for example, 89 + ... + 1994.

It is an arithmetic number, because the mean of its divisors is an integer number (497034).

2^1985099 is an apocalyptic number.

1985099 is a deficient number, since it is larger than the sum of its proper divisors (3037).

1985099 is an equidigital number, since it uses as much as digits as its factorization.

1985099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3036.

The product of its (nonzero) digits is 29160, while the sum is 41.

The square root of 1985099 is about 1408.9354137078. The cubic root of 1985099 is about 125.6784232736.

The spelling of 1985099 in words is "one million, nine hundred eighty-five thousand, ninety-nine".