1686249472 has 56 divisors (see below), whose sum is σ = 3451439376. Its totient is φ = 823345152.

The previous prime is 1686249451. The next prime is 1686249473. The reversal of 1686249472 is 2749426861.

It is not an unprimeable number, because it can be changed into a prime (1686249473) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 349863 + ... + 354649.

It is an arithmetic number, because the mean of its divisors is an integer number (61632846).

Almost surely, 2^1686249472 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1686249472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1725719688).

1686249472 is an abundant number, since it is smaller than the sum of its proper divisors (1765189904).

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

1686249472 is an frugal number, since it uses more digits than its factorization.

1686249472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4856 (or 4832 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 49.

The square root of 1686249472 is about 41063.9680498609. The cubic root of 1686249472 is about 1190.2566289736.

The spelling of 1686249472 in words is "one billion, six hundred eighty-six million, two hundred forty-nine thousand, four hundred seventy-two".