1665472 has 28 divisors (see below), whose sum is σ = 3374136. Its totient is φ = 815360.

The previous prime is 1665467. The next prime is 1665479. The reversal of 1665472 is 2745661.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665479) 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, 3147 + ... + 3637.

2^1665472 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1665472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1687068).

1665472 is an abundant number, since it is smaller than the sum of its proper divisors (1708664).

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

1665472 is an equidigital number, since it uses as much as digits as its factorization.

1665472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556 (or 546 counting only the distinct ones).

The product of its digits is 10080, while the sum is 31.

The square root of 1665472 is about 1290.5316733812. The cubic root of 1665472 is about 118.5347746992.

The spelling of 1665472 in words is "one million, six hundred sixty-five thousand, four hundred seventy-two".