1665473 has 6 divisors (see below), whose sum is σ = 1769094. Its totient is φ = 1562496.

The previous prime is 1665467. The next prime is 1665479. The reversal of 1665473 is 3745661.

It is an interprime number because it is at equal distance from previous prime (1665467) and next prime (1665479).

It can be written as a sum of positive squares in 3 ways, for example, as 44944 + 1620529 = 212^2 + 1273^2 .

It is not a de Polignac number, because 1665473 - 2¹⁶ = 1599937 is a prime.

It is a Duffinian 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 5 ways as a sum of consecutive naturals, for example, 5165 + ... + 5477.

It is an arithmetic number, because the mean of its divisors is an integer number (294849).

2^1665473 is an apocalyptic number.

It is an amenable number.

1665473 is a deficient number, since it is larger than the sum of its proper divisors (103621).

1665473 is an frugal number, since it uses more digits than its factorization.

1665473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643 (or 330 counting only the distinct ones).

The product of its digits is 15120, while the sum is 32.

The square root of 1665473 is about 1290.5320608183. The cubic root of 1665473 is about 118.5347984231.

The spelling of 1665473 in words is "one million, six hundred sixty-five thousand, four hundred seventy-three".