1686223212 has 48 divisors (see below), whose sum is σ = 4076133600. Its totient is φ = 541900800.

The previous prime is 1686223171. The next prime is 1686223247. The reversal of 1686223212 is 2123226861.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 264462 + ... + 270762.

It is an arithmetic number, because the mean of its divisors is an integer number (84919450).

Almost surely, 2^1686223212 is an apocalyptic number.

1686223212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1686223212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2038066800).

1686223212 is an abundant number, since it is smaller than the sum of its proper divisors (2389910388).

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

1686223212 is a wasteful number, since it uses less digits than its factorization.

1686223212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7106 (or 7104 counting only the distinct ones).

The product of its digits is 13824, while the sum is 33.

The square root of 1686223212 is about 41063.6483035787. The cubic root of 1686223212 is about 1190.2504503107.

The spelling of 1686223212 in words is "one billion, six hundred eighty-six million, two hundred twenty-three thousand, two hundred twelve".