685129903 has 8 divisors (see below), whose sum is σ = 725774688. Its totient is φ = 644523264.

The previous prime is 685129897. The next prime is 685129931. The reversal of 685129903 is 309921586.

It is a happy number.

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 685129903 - 2⁹ = 685129391 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 685129903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685129943) 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, 32875 + ... + 49507.

It is an arithmetic number, because the mean of its divisors is an integer number (90721836).

Almost surely, 2^685129903 is an apocalyptic number.

685129903 is a deficient number, since it is larger than the sum of its proper divisors (40644785).

685129903 is a wasteful number, since it uses less digits than its factorization.

685129903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19073.

The product of its (nonzero) digits is 116640, while the sum is 43.

The square root of 685129903 is about 26174.9862082103. The cubic root of 685129903 is about 881.5717018192.

The spelling of 685129903 in words is "six hundred eighty-five million, one hundred twenty-nine thousand, nine hundred three".