1605920 has 24 divisors (see below), whose sum is σ = 3794364. Its totient is φ = 642304.

The previous prime is 1605913. The next prime is 1605931. The reversal of 1605920 is 295061.

It can be written as a sum of positive squares in 2 ways, for example, as 1567504 + 38416 = 1252^2 + 196^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4859 + ... + 5178.

2^1605920 is an apocalyptic number.

1605920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1605920 is an abundant number, since it is smaller than the sum of its proper divisors (2188444).

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

1605920 is a wasteful number, since it uses less digits than its factorization.

1605920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10052 (or 10044 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 1605920 is about 1267.2489889521. The cubic root of 1605920 is about 117.1047835248.

The spelling of 1605920 in words is "one million, six hundred five thousand, nine hundred twenty".