685137385 has 8 divisors (see below), whose sum is σ = 822419136. Its totient is φ = 547940400.

The previous prime is 685137367. The next prime is 685137391. The reversal of 685137385 is 583731586.

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

It is not a de Polignac number, because 685137385 - 2²¹ = 683040233 is a prime.

It is a Duffinian 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, 1791 + ... + 37060.

It is an arithmetic number, because the mean of its divisors is an integer number (102802392).

Almost surely, 2^685137385 is an apocalyptic number.

It is an amenable number.

685137385 is a deficient number, since it is larger than the sum of its proper divisors (137281751).

685137385 is a wasteful number, since it uses less digits than its factorization.

685137385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42383.

The product of its digits is 604800, while the sum is 46.

The square root of 685137385 is about 26175.1291305315. The cubic root of 685137385 is about 881.5749108922.

The spelling of 685137385 in words is "six hundred eighty-five million, one hundred thirty-seven thousand, three hundred eighty-five".