685919 has 8 divisors (see below), whose sum is σ = 777840. Its totient is φ = 599616.

The previous prime is 685907. The next prime is 685939. The reversal of 685919 is 919586.

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 685919 - 2¹² = 681823 is a prime.

It is a super-2 number, since 2×685919² = 940969749122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685939) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1142 + ... + 1635.

It is an arithmetic number, because the mean of its divisors is an integer number (97230).

2⁶⁸⁵⁹¹⁹ is an apocalyptic number.

685919 is a deficient number, since it is larger than the sum of its proper divisors (91921).

685919 is a wasteful number, since it uses less digits than its factorization.

685919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2809.

The product of its digits is 19440, while the sum is 38.

The square root of 685919 is about 828.2022699800. The cubic root of 685919 is about 88.1910021450.

It can be divided in two parts, 6859 and 19, that multiplied together give a 4-th power (130321 = 19⁴).

The spelling of 685919 in words is "six hundred eighty-five thousand, nine hundred nineteen".