1665616 has 20 divisors (see below), whose sum is σ = 3397600. Its totient is φ = 788832.

The previous prime is 1665611. The next prime is 1665619. The reversal of 1665616 is 6165661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2436 + ... + 3043.

It is an arithmetic number, because the mean of its divisors is an integer number (169880).

2^1665616 is an apocalyptic number.

1665616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1665616 is an abundant number, since it is smaller than the sum of its proper divisors (1731984).

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

1665616 is a wasteful number, since it uses less digits than its factorization.

1665616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5506 (or 5500 counting only the distinct ones).

The product of its digits is 6480, while the sum is 31.

The square root of 1665616 is about 1290.5874631345. The cubic root of 1665616 is about 118.5381908510.

The spelling of 1665616 in words is "one million, six hundred sixty-five thousand, six hundred sixteen".