1780873 has 2 divisors, whose sum is σ = 1780874. Its totient is φ = 1780872.

The previous prime is 1780837. The next prime is 1780879. The reversal of 1780873 is 3780871.

It is a happy number.

Together with previous prime (1780837) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1159929 + 620944 = 1077^2 + 788^2 .

It is an emirp because it is prime and its reverse (3780871) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1780873 - 2¹⁷ = 1649801 is a prime.

It is not a weakly prime, because it can be changed into another prime (1780879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 890436 + 890437.

It is an arithmetic number, because the mean of its divisors is an integer number (890437).

2^1780873 is an apocalyptic number.

It is an amenable number.

1780873 is a deficient number, since it is larger than the sum of its proper divisors (1).

1780873 is an equidigital number, since it uses as much as digits as its factorization.

1780873 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9408, while the sum is 34.

The square root of 1780873 is about 1334.4935368896. The cubic root of 1780873 is about 121.2116369936.

The spelling of 1780873 in words is "one million, seven hundred eighty thousand, eight hundred seventy-three".