1685659493 has 8 divisors (see below), whose sum is σ = 1953601920. Its totient is φ = 1424500560.

The previous prime is 1685659487. The next prime is 1685659511. The reversal of 1685659493 is 3949565861.

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

It is not a de Polignac number, because 1685659493 - 2²⁶ = 1618550629 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1685659403) 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, 1695338 + ... + 1696331.

It is an arithmetic number, because the mean of its divisors is an integer number (244200240).

Almost surely, 2^1685659493 is an apocalyptic number.

It is an amenable number.

1685659493 is a deficient number, since it is larger than the sum of its proper divisors (267942427).

1685659493 is an equidigital number, since it uses as much as digits as its factorization.

1685659493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3391747.

The product of its digits is 6998400, while the sum is 56.

The square root of 1685659493 is about 41056.7837634659. The cubic root of 1685659493 is about 1190.1177985216.

The spelling of 1685659493 in words is "one billion, six hundred eighty-five million, six hundred fifty-nine thousand, four hundred ninety-three".