1685943540 has 72 divisors (see below), whose sum is σ = 5117400288. Its totient is φ = 449288640.

The previous prime is 1685943521. The next prime is 1685943547. The reversal of 1685943540 is 453495861.

1685943540 is a `hidden beast` number, since 1 + 6 + 8 + 594 + 3 + 54 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1685943547) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 481195 + ... + 484685.

It is an arithmetic number, because the mean of its divisors is an integer number (71075004).

Almost surely, 2^1685943540 is an apocalyptic number.

1685943540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1685943540 is an abundant number, since it is smaller than the sum of its proper divisors (3431456748).

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

1685943540 is a wasteful number, since it uses less digits than its factorization.

1685943540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6189 (or 6184 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 45.

The square root of 1685943540 is about 41060.2428146741. The cubic root of 1685943540 is about 1190.1846428646.

The spelling of 1685943540 in words is "one billion, six hundred eighty-five million, nine hundred forty-three thousand, five hundred forty".