686479 has 2 divisors, whose sum is σ = 686480. Its totient is φ = 686478.

The previous prime is 686473. The next prime is 686503. The reversal of 686479 is 974686.

686479 = T₆₇₅ + T₆₇₆ + T₆₇₇.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 686479 - 2¹⁵ = 653711 is a prime.

686479 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (686473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343239 + 343240.

It is an arithmetic number, because the mean of its divisors is an integer number (343240).

2⁶⁸⁶⁴⁷⁹ is an apocalyptic number.

686479 is the 677-th centered triangular number.

686479 is a deficient number, since it is larger than the sum of its proper divisors (1).

686479 is an equidigital number, since it uses as much as digits as its factorization.

686479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 40.

The square root of 686479 is about 828.5402826658. The cubic root of 686479 is about 88.2149960019.

The spelling of 686479 in words is "six hundred eighty-six thousand, four hundred seventy-nine".