1684729139 has 8 divisors (see below), whose sum is σ = 1759029792. Its totient is φ = 1610516160.

The previous prime is 1684729133. The next prime is 1684729153. The reversal of 1684729139 is 9319274861.

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 1684729139 - 2²⁰ = 1683680563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1684729133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19007 + ... + 61079.

It is an arithmetic number, because the mean of its divisors is an integer number (219878724).

Almost surely, 2^1684729139 is an apocalyptic number.

1684729139 is a deficient number, since it is larger than the sum of its proper divisors (74300653).

1684729139 is a wasteful number, since it uses less digits than its factorization.

1684729139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43837.

The product of its digits is 653184, while the sum is 50.

The square root of 1684729139 is about 41045.4521110439. The cubic root of 1684729139 is about 1189.8988071568.

The spelling of 1684729139 in words is "one billion, six hundred eighty-four million, seven hundred twenty-nine thousand, one hundred thirty-nine".