1685538339 has 4 divisors (see below), whose sum is σ = 2247384456. Its totient is φ = 1123692224.

The previous prime is 1685538311. The next prime is 1685538343. The reversal of 1685538339 is 9338355861.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1685538339 - 2⁵ = 1685538307 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1685538291 and 1685538300.

It is not an unprimeable number, because it can be changed into a prime (1685538359) 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, 280923054 + ... + 280923059.

It is an arithmetic number, because the mean of its divisors is an integer number (561846114).

Almost surely, 2^1685538339 is an apocalyptic number.

1685538339 is a deficient number, since it is larger than the sum of its proper divisors (561846117).

1685538339 is an equidigital number, since it uses as much as digits as its factorization.

1685538339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561846116.

The product of its digits is 2332800, while the sum is 51.

The square root of 1685538339 is about 41055.3082925948. The cubic root of 1685538339 is about 1190.0892852529.

The spelling of 1685538339 in words is "one billion, six hundred eighty-five million, five hundred thirty-eight thousand, three hundred thirty-nine".