1665560 has 32 divisors (see below), whose sum is σ = 4037040. Its totient is φ = 614784.

The previous prime is 1665533. The next prime is 1665563. The reversal of 1665560 is 655661.

It is a super-2 number, since 2×1665560² = 5548180227200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1082 + ... + 2121.

2^1665560 is an apocalyptic number.

1665560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1665560 is an abundant number, since it is smaller than the sum of its proper divisors (2371480).

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

1665560 is a wasteful number, since it uses less digits than its factorization.

1665560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3227 (or 3223 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 1665560 is about 1290.5657674059. The cubic root of 1665560 is about 118.5368623709.

The spelling of 1665560 in words is "one million, six hundred sixty-five thousand, five hundred sixty".