686743838 has 16 divisors (see below), whose sum is σ = 1162514160. Its totient is φ = 301392000.

The previous prime is 686743807. The next prime is 686743853. The reversal of 686743838 is 838347686.

It is a self number, because there is not a number n which added to its sum of digits gives 686743838.

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, 537563 + ... + 538838.

It is an arithmetic number, because the mean of its divisors is an integer number (72657135).

Almost surely, 2^686743838 is an apocalyptic number.

686743838 is a deficient number, since it is larger than the sum of its proper divisors (475770322).

686743838 is a wasteful number, since it uses less digits than its factorization.

686743838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1076443.

The product of its digits is 4644864, while the sum is 53.

The square root of 686743838 is about 26205.7977936181. The cubic root of 686743838 is about 882.2633875206.

It can be divided in two parts, 6867 and 43838, that added together give a palindrome (50705).

The spelling of 686743838 in words is "six hundred eighty-six million, seven hundred forty-three thousand, eight hundred thirty-eight".