1985009 has 16 divisors (see below), whose sum is σ = 2261952. Its totient is φ = 1729728.

The previous prime is 1985003. The next prime is 1985017. The reversal of 1985009 is 9005891.

It is not a de Polignac number, because 1985009 - 2⁸ = 1984753 is a prime.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1985003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29594 + ... + 29660.

It is an arithmetic number, because the mean of its divisors is an integer number (141372).

2^1985009 is an apocalyptic number.

It is an amenable number.

1985009 is a deficient number, since it is larger than the sum of its proper divisors (276943).

1985009 is a wasteful number, since it uses less digits than its factorization.

1985009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176.

The product of its (nonzero) digits is 3240, while the sum is 32.

The square root of 1985009 is about 1408.9034743374. The cubic root of 1985009 is about 125.6765239176.

The spelling of 1985009 in words is "one million, nine hundred eighty-five thousand, nine".