1665916 has 12 divisors (see below), whose sum is σ = 3331888. Its totient is φ = 713952.

The previous prime is 1665907. The next prime is 1665919. The reversal of 1665916 is 6195661.

1665916 is an admirable number.

It is a super-2 number, since 2×1665916² = 5550552238112, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29721 + ... + 29776.

2^1665916 is an apocalyptic number.

It is an amenable number.

1665916 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1665916 is a wasteful number, since it uses less digits than its factorization.

1665916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59508 (or 59506 counting only the distinct ones).

The product of its digits is 9720, while the sum is 34.

The square root of 1665916 is about 1290.7036840422. The cubic root of 1665916 is about 118.5453072016.

The spelling of 1665916 in words is "one million, six hundred sixty-five thousand, nine hundred sixteen".