1609985 has 32 divisors (see below), whose sum is σ = 2322432. Its totient is φ = 1059840.

The previous prime is 1609969. The next prime is 1609991. The reversal of 1609985 is 5899061.

It is not a de Polignac number, because 1609985 - 2⁴ = 1609969 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34232 + ... + 34278.

It is an arithmetic number, because the mean of its divisors is an integer number (72576).

2^1609985 is an apocalyptic number.

It is an amenable number.

1609985 is a deficient number, since it is larger than the sum of its proper divisors (712447).

1609985 is a wasteful number, since it uses less digits than its factorization.

1609985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113.

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 1609985 is about 1268.8518432031. The cubic root of 1609985 is about 117.2035077984.

The spelling of 1609985 in words is "one million, six hundred nine thousand, nine hundred eighty-five".