2780047 has 2 divisors, whose sum is σ = 2780048.
Its totient is φ = 2780046.
The previous prime is 2780039. The next prime is 2780053. The reversal of 2780047 is 7400872.
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 2780047 - 23 = 2780039 is a prime.
It is a super-2 number, since 2×27800472 = 15457322644418, which contains 22 as substring.
It is a junction number, because it is equal to n+sod(n) for n = 2779997 and 2780024.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (2780077) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1390023 + 1390024.
It is an arithmetic number, because the mean of its divisors is an integer number (1390024).
22780047 is an apocalyptic number.
2780047 is a deficient number, since it is larger than the sum of its proper divisors (1).
2780047 is an equidigital number, since it uses as much as digits as its factorization.
2780047 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 3136, while the sum is 28.
The square root of 2780047 is about 1667.3472943571.
The cubic root of 2780047 is about 140.6103791877.
The spelling of 2780047 in words is "two million, seven hundred eighty thousand, forty-seven".