1604985 has 16 divisors (see below), whose sum is σ = 2607936. Its totient is φ = 842688.

The previous prime is 1604983. The next prime is 1605001. The reversal of 1604985 is 5894061.

It is not a de Polignac number, because 1604985 - 2¹ = 1604983 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1604983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 207 + ... + 1803.

It is an arithmetic number, because the mean of its divisors is an integer number (162996).

2^1604985 is an apocalyptic number.

1604985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1604985 is a deficient number, since it is larger than the sum of its proper divisors (1002951).

1604985 is a wasteful number, since it uses less digits than its factorization.

1604985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1672.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 1604985 is about 1266.8800258904. The cubic root of 1604985 is about 117.0820521665.

The spelling of 1604985 in words is "one million, six hundred four thousand, nine hundred eighty-five".