1665172 has 12 divisors (see below), whose sum is σ = 2926336. Its totient is φ = 829080.

The previous prime is 1665161. The next prime is 1665173. The reversal of 1665172 is 2715661.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1665172.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665173) 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, 397 + ... + 1867.

2^1665172 is an apocalyptic number.

It is an amenable number.

1665172 is a deficient number, since it is larger than the sum of its proper divisors (1261164).

1665172 is a wasteful number, since it uses less digits than its factorization.

1665172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1758 (or 1756 counting only the distinct ones).

The product of its digits is 2520, while the sum is 28.

The square root of 1665172 is about 1290.4154369814. The cubic root of 1665172 is about 118.5276570837.

The spelling of 1665172 in words is "one million, six hundred sixty-five thousand, one hundred seventy-two".