1789945 has 4 divisors (see below), whose sum is σ = 2147940. Its totient is φ = 1431952.

The previous prime is 1789927. The next prime is 1789951. The reversal of 1789945 is 5499871.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5499871 = 13 ⋅423067.

It can be written as a sum of positive squares in 2 ways, for example, as 281961 + 1507984 = 531^2 + 1228^2 .

It is a cyclic number.

It is not a de Polignac number, because 1789945 - 2⁹ = 1789433 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 178990 + ... + 178999.

It is an arithmetic number, because the mean of its divisors is an integer number (536985).

2^1789945 is an apocalyptic number.

It is an amenable number.

1789945 is a deficient number, since it is larger than the sum of its proper divisors (357995).

1789945 is an equidigital number, since it uses as much as digits as its factorization.

1789945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357994.

The product of its digits is 90720, while the sum is 43.

The square root of 1789945 is about 1337.8882614030. Note that the first 3 decimals coincide. The cubic root of 1789945 is about 121.4171111280.

The spelling of 1789945 in words is "one million, seven hundred eighty-nine thousand, nine hundred forty-five".