1685557389 has 8 divisors (see below), whose sum is σ = 2319907072. Its totient is φ = 1087456320.

The previous prime is 1685557333. The next prime is 1685557397. The reversal of 1685557389 is 9837555861.

It is a happy number.

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

It is not a de Polignac number, because 1685557389 - 2¹⁷ = 1685426317 is a prime.

It is a super-2 number, since 2×1685557389² = 5682207423224994642, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1685557189) 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, 9062044 + ... + 9062229.

It is an arithmetic number, because the mean of its divisors is an integer number (289988384).

Almost surely, 2^1685557389 is an apocalyptic number.

It is an amenable number.

1685557389 is a deficient number, since it is larger than the sum of its proper divisors (634349683).

1685557389 is a wasteful number, since it uses less digits than its factorization.

1685557389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18124307.

The product of its digits is 9072000, while the sum is 57.

The square root of 1685557389 is about 41055.5402960429. The cubic root of 1685557389 is about 1190.0937687098.

The spelling of 1685557389 in words is "one billion, six hundred eighty-five million, five hundred fifty-seven thousand, three hundred eighty-nine".