1686336421 has 24 divisors (see below), whose sum is σ = 2146293504. Its totient is φ = 1310158080.

The previous prime is 1686336397. The next prime is 1686336433. The reversal of 1686336421 is 1246336861.

It is not a de Polignac number, because 1686336421 - 2¹³ = 1686328229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1686336451) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 185836 + ... + 194698.

It is an arithmetic number, because the mean of its divisors is an integer number (89428896).

Almost surely, 2^1686336421 is an apocalyptic number.

1686336421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1686336421 is a deficient number, since it is larger than the sum of its proper divisors (459957083).

1686336421 is a wasteful number, since it uses less digits than its factorization.

1686336421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9241 (or 9234 counting only the distinct ones).

The product of its digits is 124416, while the sum is 40.

The square root of 1686336421 is about 41065.0267380894. The cubic root of 1686336421 is about 1190.2770865723.

The spelling of 1686336421 in words is "one billion, six hundred eighty-six million, three hundred thirty-six thousand, four hundred twenty-one".