1663173 has 10 divisors (see below), whose sum is σ = 2484614. Its totient is φ = 1108728.

The previous prime is 1663169. The next prime is 1663183. The reversal of 1663173 is 3713661.

It can be written as a sum of positive squares in only one way, i.e., 1520289 + 142884 = 1233^2 + 378^2 .

It is not a de Polignac number, because 1663173 - 2² = 1663169 is a prime.

It is a super-2 number, since 2×1663173² = 5532288855858, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

1663173 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663133) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 10186 + ... + 10347.

2^1663173 is an apocalyptic number.

It is an amenable number.

1663173 is a deficient number, since it is larger than the sum of its proper divisors (821441).

1663173 is an equidigital number, since it uses as much as digits as its factorization.

1663173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20545 (or 20536 counting only the distinct ones).

The product of its digits is 2268, while the sum is 27.

The square root of 1663173 is about 1289.6406476224. The cubic root of 1663173 is about 118.4802081991.

The spelling of 1663173 in words is "one million, six hundred sixty-three thousand, one hundred seventy-three".