1685811408 has 20 divisors (see below), whose sum is σ = 4355012928. Its totient is φ = 561937120.

The previous prime is 1685811401. The next prime is 1685811419. The reversal of 1685811408 is 8041185861.

It is a self number, because there is not a number n which added to its sum of digits gives 1685811408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1685811401) 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, 17560488 + ... + 17560583.

Almost surely, 2^1685811408 is an apocalyptic number.

It is an amenable number.

1685811408 is an abundant number, since it is smaller than the sum of its proper divisors (2669201520).

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

1685811408 is a wasteful number, since it uses less digits than its factorization.

1685811408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35121082 (or 35121076 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 42.

The square root of 1685811408 is about 41058.6337814594. The cubic root of 1685811408 is about 1190.1535493786.

The spelling of 1685811408 in words is "one billion, six hundred eighty-five million, eight hundred eleven thousand, four hundred eight".