686129222 has 8 divisors (see below), whose sum is σ = 1031241456. Its totient is φ = 342382072.

The previous prime is 686129207. The next prime is 686129239. The reversal of 686129222 is 222921686.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 340013 + ... + 342024.

It is an arithmetic number, because the mean of its divisors is an integer number (128905182).

Almost surely, 2^686129222 is an apocalyptic number.

686129222 is a deficient number, since it is larger than the sum of its proper divisors (345112234).

686129222 is a wasteful number, since it uses less digits than its factorization.

686129222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 682542.

The product of its digits is 41472, while the sum is 38.

The square root of 686129222 is about 26194.0684507008. The cubic root of 686129222 is about 882.0001088367. Note that the first 3 decimals are identical.

The spelling of 686129222 in words is "six hundred eighty-six million, one hundred twenty-nine thousand, two hundred twenty-two".