687422843 has 2 divisors, whose sum is σ = 687422844. Its totient is φ = 687422842.

The previous prime is 687422837. The next prime is 687422909. The reversal of 687422843 is 348224786.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 687422843 - 2¹² = 687418747 is a prime.

It is a super-3 number, since 3×687422843³ (a number of 27 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 687422794 and 687422803.

It is not a weakly prime, because it can be changed into another prime (687422833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343711421 + 343711422.

It is an arithmetic number, because the mean of its divisors is an integer number (343711422).

Almost surely, 2^687422843 is an apocalyptic number.

687422843 is a deficient number, since it is larger than the sum of its proper divisors (1).

687422843 is an equidigital number, since it uses as much as digits as its factorization.

687422843 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 516096, while the sum is 44.

The square root of 687422843 is about 26218.7498367104. The cubic root of 687422843 is about 882.5540654949.

The spelling of 687422843 in words is "six hundred eighty-seven million, four hundred twenty-two thousand, eight hundred forty-three".