1665396 has 18 divisors (see below), whose sum is σ = 4209842. Its totient is φ = 555120.

The previous prime is 1665343. The next prime is 1665421. The reversal of 1665396 is 6935661.

It can be written as a sum of positive squares in only one way, i.e., 1664100 + 1296 = 1290^2 + 36^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 46261 = 1665396 / (1 + 6 + 6 + 5 + 3 + 9 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 1665396.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23095 + ... + 23166.

2^1665396 is an apocalyptic number.

It is an amenable number.

1665396 is an abundant number, since it is smaller than the sum of its proper divisors (2544446).

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

1665396 is a wasteful number, since it uses less digits than its factorization.

1665396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46271 (or 46266 counting only the distinct ones).

The product of its digits is 29160, while the sum is 36.

The square root of 1665396 is about 1290.5022278168. The cubic root of 1665396 is about 118.5329716508.

The spelling of 1665396 in words is "one million, six hundred sixty-five thousand, three hundred ninety-six".