685433238 has 16 divisors (see below), whose sum is σ = 1566704640. Its totient is φ = 195838056.

The previous prime is 685433237. The next prime is 685433261. The reversal of 685433238 is 832334586.

It is a happy number.

685433238 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 16319839 = 685433238 / (6 + 8 + 5 + 4 + 3 + 3 + 2 + 3 + 8).

It is a self number, because there is not a number n which added to its sum of digits gives 685433238.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685433237) 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, 8159878 + ... + 8159961.

It is an arithmetic number, because the mean of its divisors is an integer number (97919040).

Almost surely, 2^685433238 is an apocalyptic number.

685433238 is an abundant number, since it is smaller than the sum of its proper divisors (881271402).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

685433238 is a wasteful number, since it uses less digits than its factorization.

685433238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16319851.

The product of its digits is 414720, while the sum is 42.

The square root of 685433238 is about 26180.7799349064. The cubic root of 685433238 is about 881.7017852268.

The spelling of 685433238 in words is "six hundred eighty-five million, four hundred thirty-three thousand, two hundred thirty-eight".