2780873 has 2 divisors, whose sum is σ = 2780874. Its totient is φ = 2780872.

The previous prime is 2780837. The next prime is 2780887. The reversal of 2780873 is 3780872.

It is a happy number.

Together with previous prime (2780837) 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., 2598544 + 182329 = 1612^2 + 427^2 .

It is a cyclic number.

It is not a de Polignac number, because 2780873 - 2¹⁶ = 2715337 is a prime.

It is not a weakly prime, because it can be changed into another prime (2780273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1390436 + 1390437.

It is an arithmetic number, because the mean of its divisors is an integer number (1390437).

2^2780873 is an apocalyptic number.

It is an amenable number.

2780873 is a deficient number, since it is larger than the sum of its proper divisors (1).

2780873 is an equidigital number, since it uses as much as digits as its factorization.

2780873 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 2780873 is about 1667.5949748065. The cubic root of 2780873 is about 140.6243037332.

Subtracting 2780873 from its reverse (3780872), we obtain a palindrome (999999).

The spelling of 2780873 in words is "two million, seven hundred eighty thousand, eight hundred seventy-three".