686396738 has 16 divisors (see below), whose sum is σ = 1041346176. Its totient is φ = 339292800.

The previous prime is 686396719. The next prime is 686396741. The reversal of 686396738 is 837693686.

It is a super-2 number, since 2×686396738² = 942280963874081288, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136163 + ... + 141113.

It is an arithmetic number, because the mean of its divisors is an integer number (65084136).

Almost surely, 2^686396738 is an apocalyptic number.

686396738 is a deficient number, since it is larger than the sum of its proper divisors (354949438).

686396738 is a wasteful number, since it uses less digits than its factorization.

686396738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5729.

The product of its digits is 7838208, while the sum is 56.

The square root of 686396738 is about 26199.1743763043. The cubic root of 686396738 is about 882.1147220783.

The spelling of 686396738 in words is "six hundred eighty-six million, three hundred ninety-six thousand, seven hundred thirty-eight".