1685051840 has 28 divisors (see below), whose sum is σ = 4012530456. Its totient is φ = 674020608.

The previous prime is 1685051833. The next prime is 1685051867. The reversal of 1685051840 is 481505861.

It is a junction number, because it is equal to n+sod(n) for n = 1685051794 and 1685051803.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2632574 + ... + 2633213.

Almost surely, 2^1685051840 is an apocalyptic number.

1685051840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1685051840 is an abundant number, since it is smaller than the sum of its proper divisors (2327478616).

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

1685051840 is an equidigital number, since it uses as much as digits as its factorization.

1685051840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5265804 (or 5265794 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 38.

The square root of 1685051840 is about 41049.3829429871. The cubic root of 1685051840 is about 1189.9747752580.

The spelling of 1685051840 in words is "one billion, six hundred eighty-five million, fifty-one thousand, eight hundred forty".