686919384 has 48 divisors (see below), whose sum is σ = 1866449520. Its totient is φ = 228229440.

The previous prime is 686919383. The next prime is 686919397. The reversal of 686919384 is 483919686.

686919384 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 2×686919384² = 943716480229878912, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 686919384.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686919383) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7054 + ... + 37730.

It is an arithmetic number, because the mean of its divisors is an integer number (38884365).

Almost surely, 2^686919384 is an apocalyptic number.

It is an amenable number.

686919384 is an abundant number, since it is smaller than the sum of its proper divisors (1179530136).

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

686919384 is a wasteful number, since it uses less digits than its factorization.

686919384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31000 (or 30993 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 54.

The square root of 686919384 is about 26209.1469529247. The cubic root of 686919384 is about 882.3385560698.

The spelling of 686919384 in words is "six hundred eighty-six million, nine hundred nineteen thousand, three hundred eighty-four".