1685840736 has 24 divisors (see below), whose sum is σ = 4425332184. Its totient is φ = 561946880.

The previous prime is 1685840719. The next prime is 1685840749. The reversal of 1685840736 is 6370485861.

1685840736 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 8780325 + ... + 8780516.

It is an arithmetic number, because the mean of its divisors is an integer number (184388841).

Almost surely, 2^1685840736 is an apocalyptic number.

1685840736 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1685840736 is an abundant number, since it is smaller than the sum of its proper divisors (2739491448).

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

1685840736 is a wasteful number, since it uses less digits than its factorization.

1685840736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17560854 (or 17560846 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 48.

The square root of 1685840736 is about 41058.9909276884. The cubic root of 1685840736 is about 1190.1604510246.

The spelling of 1685840736 in words is "one billion, six hundred eighty-five million, eight hundred forty thousand, seven hundred thirty-six".