686042407 has 2 divisors, whose sum is σ = 686042408. Its totient is φ = 686042406.

The previous prime is 686042347. The next prime is 686042437. The reversal of 686042407 is 704240686.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 686042407 - 2¹¹ = 686040359 is a prime.

It is a super-4 number, since 4×686042407⁴ (a number of 36 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (686042437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343021203 + 343021204.

It is an arithmetic number, because the mean of its divisors is an integer number (343021204).

Almost surely, 2^686042407 is an apocalyptic number.

686042407 is a deficient number, since it is larger than the sum of its proper divisors (1).

686042407 is an equidigital number, since it uses as much as digits as its factorization.

686042407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512, while the sum is 37.

The square root of 686042407 is about 26192.4112482986. The cubic root of 686042407 is about 881.9629078417.

The spelling of 686042407 in words is "six hundred eighty-six million, forty-two thousand, four hundred seven".