685143905 has 8 divisors (see below), whose sum is σ = 822396672. Its totient is φ = 547965808.

The previous prime is 685143889. The next prime is 685143913. The reversal of 685143905 is 509341586.

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

It is a cyclic number.

It is not a de Polignac number, because 685143905 - 2⁴ = 685143889 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4034 + ... + 37236.

It is an arithmetic number, because the mean of its divisors is an integer number (102799584).

Almost surely, 2^685143905 is an apocalyptic number.

It is an amenable number.

685143905 is a deficient number, since it is larger than the sum of its proper divisors (137252767).

685143905 is a wasteful number, since it uses less digits than its factorization.

685143905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37335.

The product of its (nonzero) digits is 129600, while the sum is 41.

The square root of 685143905 is about 26175.2536759436. The cubic root of 685143905 is about 881.5777073387.

The spelling of 685143905 in words is "six hundred eighty-five million, one hundred forty-three thousand, nine hundred five".