1685038520 has 32 divisors (see below), whose sum is σ = 4136004720. Its totient is φ = 612741120.

The previous prime is 1685038499. The next prime is 1685038529. The reversal of 1685038520 is 258305861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1685038529) 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, 1914377 + ... + 1915256.

Almost surely, 2^1685038520 is an apocalyptic number.

1685038520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1685038520 is an abundant number, since it is smaller than the sum of its proper divisors (2450966200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1685038520 is a wasteful number, since it uses less digits than its factorization.

1685038520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3829655 (or 3829651 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 38.

The square root of 1685038520 is about 41049.2206990583. The cubic root of 1685038520 is about 1189.9716397450.

The spelling of 1685038520 in words is "one billion, six hundred eighty-five million, thirty-eight thousand, five hundred twenty".