685842215 has 8 divisors (see below), whose sum is σ = 836503008. Its totient is φ = 539678880.

The previous prime is 685842181. The next prime is 685842229. The reversal of 685842215 is 512248586.

It is a happy number.

685842215 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a de Polignac number, because none of the positive numbers 2^k-685842215 is a prime.

It is a super-2 number, since 2×685842215² = 940759087752212450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent 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, 1124027 + ... + 1124636.

It is an arithmetic number, because the mean of its divisors is an integer number (104562876).

Almost surely, 2^685842215 is an apocalyptic number.

685842215 is a deficient number, since it is larger than the sum of its proper divisors (150660793).

685842215 is a wasteful number, since it uses less digits than its factorization.

685842215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2248729.

The product of its digits is 153600, while the sum is 41.

The square root of 685842215 is about 26188.5894045479. The cubic root of 685842215 is about 881.8771118358.

The spelling of 685842215 in words is "six hundred eighty-five million, eight hundred forty-two thousand, two hundred fifteen".