686381898 has 16 divisors (see below), whose sum is σ = 1373027040. Its totient is φ = 228750096.

The previous prime is 686381879. The next prime is 686381903. The reversal of 686381898 is 898183686.

686381898 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×686381898² = 942240219804164808, which contains 22 as substring.

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, 44536 + ... + 57932.

It is an arithmetic number, because the mean of its divisors is an integer number (85814190).

Almost surely, 2^686381898 is an apocalyptic number.

686381898 is an abundant number, since it is smaller than the sum of its proper divisors (686645142).

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

686381898 is a wasteful number, since it uses less digits than its factorization.

686381898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21941.

The product of its digits is 3981312, while the sum is 57.

The square root of 686381898 is about 26198.8911597419. The cubic root of 686381898 is about 882.1083648818.

The spelling of 686381898 in words is "six hundred eighty-six million, three hundred eighty-one thousand, eight hundred ninety-eight".