1665612 has 36 divisors (see below), whose sum is σ = 4535440. Its totient is φ = 512352.

The previous prime is 1665611. The next prime is 1665619. The reversal of 1665612 is 2165661.

It is a happy number.

1665612 is a `hidden beast` number, since 1 + 6 + 656 + 1 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a nialpdrome in base 6.

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 11 ways as a sum of consecutive naturals, for example, 1312 + ... + 2247.

2^1665612 is an apocalyptic number.

1665612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1665612 is an abundant number, since it is smaller than the sum of its proper divisors (2869828).

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

1665612 is a wasteful number, since it uses less digits than its factorization.

1665612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3582 (or 3577 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 1665612 is about 1290.5859134517. The cubic root of 1665612 is about 118.5380959606.

It can be divided in two parts, 166 and 5612, that added together give a triangular number (5778 = T₁₀₇).

The spelling of 1665612 in words is "one million, six hundred sixty-five thousand, six hundred twelve".