1605660 has 48 divisors (see below), whose sum is σ = 5139456. Its totient is φ = 366912.

The previous prime is 1605631. The next prime is 1605677. The reversal of 1605660 is 665061.

It is a self number, because there is not a number n which added to its sum of digits gives 1605660.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1492 + ... + 2331.

It is an arithmetic number, because the mean of its divisors is an integer number (107072).

2^1605660 is an apocalyptic number.

1605660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1605660 is an abundant number, since it is smaller than the sum of its proper divisors (3533796).

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

1605660 is a wasteful number, since it uses less digits than its factorization.

1605660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3842 (or 3840 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 1605660 is about 1267.1464003816. The cubic root of 1605660 is about 117.0984633912.

The spelling of 1605660 in words is "one million, six hundred five thousand, six hundred sixty".