1685355372 has 36 divisors (see below), whose sum is σ = 4263095200. Its totient is φ = 561403872.

The previous prime is 1685355349. The next prime is 1685355377. The reversal of 1685355372 is 2735535861.

1685355372 is a `hidden beast` number, since 1 + 6 + 85 + 35 + 537 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (1685355377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40653 + ... + 70875.

Almost surely, 2^1685355372 is an apocalyptic number.

1685355372 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1685355372 is an abundant number, since it is smaller than the sum of its proper divisors (2577739828).

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

1685355372 is a wasteful number, since it uses less digits than its factorization.

1685355372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31782 (or 31777 counting only the distinct ones).

The product of its digits is 756000, while the sum is 45.

The square root of 1685355372 is about 41053.0799331792. The cubic root of 1685355372 is about 1190.0462218706.

The spelling of 1685355372 in words is "one billion, six hundred eighty-five million, three hundred fifty-five thousand, three hundred seventy-two".