2780339 has 2 divisors, whose sum is σ = 2780340.
Its totient is φ = 2780338.
The previous prime is 2780329. The next prime is 2780353. The reversal of 2780339 is 9330872.
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 2780339 - 28 = 2780083 is a prime.
It is a Sophie Germain prime.
It is a Chen prime.
It is an Ulam number.
It is not a weakly prime, because it can be changed into another prime (2780329) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1390169 + 1390170.
It is an arithmetic number, because the mean of its divisors is an integer number (1390170).
22780339 is an apocalyptic number.
2780339 is a deficient number, since it is larger than the sum of its proper divisors (1).
2780339 is an equidigital number, since it uses as much as digits as its factorization.
2780339 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 9072, while the sum is 32.
The square root of 2780339 is about 1667.4348562987.
The cubic root of 2780339 is about 140.6153019814.
The spelling of 2780339 in words is "two million, seven hundred eighty thousand, three hundred thirty-nine".