2081604 has 24 divisors (see below), whose sum is σ = 5551168. Its totient is φ = 594720.

The previous prime is 2081603. The next prime is 2081609. The reversal of 2081604 is 4061802.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (2081603) 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 7 ways as a sum of consecutive naturals, for example, 12307 + ... + 12474.

2^2081604 is an apocalyptic number.

It is an amenable number.

2081604 is an abundant number, since it is smaller than the sum of its proper divisors (3469564).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2081604 is a wasteful number, since it uses less digits than its factorization.

2081604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24795 (or 24793 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 2081604 is about 1442.7764899665. The cubic root of 2081604 is about 127.6828901645.

The spelling of 2081604 in words is "two million, eighty-one thousand, six hundred four".