866839349 has 2 divisors, whose sum is σ = 866839350. Its totient is φ = 866839348.

The previous prime is 866839339. The next prime is 866839357. The reversal of 866839349 is 943938668.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 655718449 + 211120900 = 25607^2 + 14530^2 .

It is a cyclic number.

It is not a de Polignac number, because 866839349 - 2¹⁶ = 866773813 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 866839294 and 866839303.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866839339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433419674 + 433419675.

It is an arithmetic number, because the mean of its divisors is an integer number (433419675).

Almost surely, 2^866839349 is an apocalyptic number.

It is an amenable number.

866839349 is a deficient number, since it is larger than the sum of its proper divisors (1).

866839349 is an equidigital number, since it uses as much as digits as its factorization.

866839349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6718464, while the sum is 56.

The square root of 866839349 is about 29442.1356052852. The cubic root of 866839349 is about 953.4828203678.

The spelling of 866839349 in words is "eight hundred sixty-six million, eight hundred thirty-nine thousand, three hundred forty-nine".