1685882740 has 12 divisors (see below), whose sum is σ = 3540353796. Its totient is φ = 674353088.

The previous prime is 1685882729. The next prime is 1685882747. The reversal of 1685882740 is 472885861.

It can be written as a sum of positive squares in 2 ways, for example, as 797723536 + 888159204 = 28244^2 + 29802^2 .

It is a super-2 number, since 2×1685882740² = 5684401226059815200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1685882747) 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, 42147049 + ... + 42147088.

It is an arithmetic number, because the mean of its divisors is an integer number (295029483).

Almost surely, 2^1685882740 is an apocalyptic number.

1685882740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1685882740 is an abundant number, since it is smaller than the sum of its proper divisors (1854471056).

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

1685882740 is a wasteful number, since it uses less digits than its factorization.

1685882740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84294146 (or 84294144 counting only the distinct ones).

The product of its (nonzero) digits is 860160, while the sum is 49.

The square root of 1685882740 is about 41059.5024324455. The cubic root of 1685882740 is about 1190.1703355258.

The spelling of 1685882740 in words is "one billion, six hundred eighty-five million, eight hundred eighty-two thousand, seven hundred forty".