686456405 has 8 divisors (see below), whose sum is σ = 850320384. Its totient is φ = 531450000.

The previous prime is 686456369. The next prime is 686456423. The reversal of 686456405 is 504654686.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 686456405 - 2⁶ = 686456341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2214221 + ... + 2214530.

It is an arithmetic number, because the mean of its divisors is an integer number (106290048).

Almost surely, 2^686456405 is an apocalyptic number.

It is an amenable number.

686456405 is a deficient number, since it is larger than the sum of its proper divisors (163863979).

686456405 is a wasteful number, since it uses less digits than its factorization.

686456405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4428787.

The product of its (nonzero) digits is 691200, while the sum is 44.

The square root of 686456405 is about 26200.3130706486. The cubic root of 686456405 is about 882.1402814529.

The spelling of 686456405 in words is "six hundred eighty-six million, four hundred fifty-six thousand, four hundred five".