685474047 has 12 divisors (see below), whose sum is σ = 995261904. Its totient is φ = 454613760.

The previous prime is 685474003. The next prime is 685474057. The reversal of 685474047 is 740474586.

685474047 is a `hidden beast` number, since 68 + 547 + 4 + 0 + 47 = 666.

It is not a de Polignac number, because 685474047 - 2¹⁸ = 685211903 is a prime.

It is a super-2 number, since 2×685474047² = 939749338221116418, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 685473993 and 685474011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685474057) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 195579 + ... + 199052.

It is an arithmetic number, because the mean of its divisors is an integer number (82938492).

Almost surely, 2^685474047 is an apocalyptic number.

685474047 is a deficient number, since it is larger than the sum of its proper divisors (309787857).

685474047 is a wasteful number, since it uses less digits than its factorization.

685474047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394830 (or 394827 counting only the distinct ones).

The product of its (nonzero) digits is 752640, while the sum is 45.

The square root of 685474047 is about 26181.5592927541. The cubic root of 685474047 is about 881.7192829942.

The spelling of 685474047 in words is "six hundred eighty-five million, four hundred seventy-four thousand, forty-seven".