686294387 has 2 divisors, whose sum is σ = 686294388. Its totient is φ = 686294386.

The previous prime is 686294353. The next prime is 686294419. The reversal of 686294387 is 783492686.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 686294387 - 2¹² = 686290291 is a prime.

It is not a weakly prime, because it can be changed into another prime (686291387) 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, 343147193 + 343147194.

It is an arithmetic number, because the mean of its divisors is an integer number (343147194).

Almost surely, 2^686294387 is an apocalyptic number.

686294387 is a deficient number, since it is larger than the sum of its proper divisors (1).

686294387 is an equidigital number, since it uses as much as digits as its factorization.

686294387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3483648, while the sum is 53.

The square root of 686294387 is about 26197.2209785695. The cubic root of 686294387 is about 882.0708748362.

The spelling of 686294387 in words is "six hundred eighty-six million, two hundred ninety-four thousand, three hundred eighty-seven".