1686834421 has 8 divisors (see below), whose sum is σ = 1852816320. Its totient is φ = 1528572672.

The previous prime is 1686834407. The next prime is 1686834427. The reversal of 1686834421 is 1244386861.

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

It is a cyclic number.

It is not a de Polignac number, because 1686834421 - 2⁵ = 1686834389 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 (1686834427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1929580 + ... + 1930453.

It is an arithmetic number, because the mean of its divisors is an integer number (231602040).

Almost surely, 2^1686834421 is an apocalyptic number.

It is an amenable number.

1686834421 is a deficient number, since it is larger than the sum of its proper divisors (165981899).

1686834421 is a wasteful number, since it uses less digits than its factorization.

1686834421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3860075.

The product of its digits is 221184, while the sum is 43.

The square root of 1686834421 is about 41071.0898443175. The cubic root of 1686834421 is about 1190.3942438293.

The spelling of 1686834421 in words is "one billion, six hundred eighty-six million, eight hundred thirty-four thousand, four hundred twenty-one".