1980173 has 6 divisors (see below), whose sum is σ = 2144394. Its totient is φ = 1827696.

The previous prime is 1980169. The next prime is 1980191. The reversal of 1980173 is 3710891.

It can be written as a sum of positive squares in 3 ways, for example, as 243049 + 1737124 = 493^2 + 1318^2 .

It is not a de Polignac number, because 1980173 - 2² = 1980169 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1980103) 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, 5690 + ... + 6027.

It is an arithmetic number, because the mean of its divisors is an integer number (357399).

2^1980173 is an apocalyptic number.

1980173 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1980173 is a deficient number, since it is larger than the sum of its proper divisors (164221).

1980173 is a wasteful number, since it uses less digits than its factorization.

1980173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11743 (or 11730 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 29.

The square root of 1980173 is about 1407.1861994775. The cubic root of 1980173 is about 125.5743806524.

The spelling of 1980173 in words is "one million, nine hundred eighty thousand, one hundred seventy-three".