1685471993 has 8 divisors (see below), whose sum is σ = 1801650816. Its totient is φ = 1572868000.

The previous prime is 1685471981. The next prime is 1685472011. The reversal of 1685471993 is 3991745861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1685471993 - 2⁶ = 1685471929 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1685471933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 892733 + ... + 894618.

It is an arithmetic number, because the mean of its divisors is an integer number (225206352).

Almost surely, 2^1685471993 is an apocalyptic number.

It is an amenable number.

1685471993 is a deficient number, since it is larger than the sum of its proper divisors (116178823).

1685471993 is a wasteful number, since it uses less digits than its factorization.

1685471993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1787415.

The product of its digits is 1632960, while the sum is 53.

The square root of 1685471993 is about 41054.5002770707. The cubic root of 1685471993 is about 1190.0736703209.

The spelling of 1685471993 in words is "one billion, six hundred eighty-five million, four hundred seventy-one thousand, nine hundred ninety-three".