2781347 has 2 divisors, whose sum is σ = 2781348. Its totient is φ = 2781346.

The previous prime is 2781343. The next prime is 2781349. The reversal of 2781347 is 7431872.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2781347 - 2² = 2781343 is a prime.

It is a super-2 number, since 2×2781347² = 15471782268818, which contains 22 as substring.

Together with 2781349, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2781343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1390673 + 1390674.

It is an arithmetic number, because the mean of its divisors is an integer number (1390674).

2^2781347 is an apocalyptic number.

2781347 is a deficient number, since it is larger than the sum of its proper divisors (1).

2781347 is an equidigital number, since it uses as much as digits as its factorization.

2781347 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9408, while the sum is 32.

The square root of 2781347 is about 1667.7370895918. The cubic root of 2781347 is about 140.6322930868.

The spelling of 2781347 in words is "two million, seven hundred eighty-one thousand, three hundred forty-seven".