1685072993 has 4 divisors (see below), whose sum is σ = 1695806100. Its totient is φ = 1674339888.

The previous prime is 1685072971. The next prime is 1685073001. The reversal of 1685072993 is 3992705861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 507691024 + 1177381969 = 22532^2 + 34313^2 .

It is a cyclic number.

It is not a de Polignac number, because 1685072993 - 2²⁶ = 1617964129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1685072903) 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, 5366318 + ... + 5366631.

It is an arithmetic number, because the mean of its divisors is an integer number (423951525).

Almost surely, 2^1685072993 is an apocalyptic number.

It is an amenable number.

1685072993 is a deficient number, since it is larger than the sum of its proper divisors (10733107).

1685072993 is a wasteful number, since it uses less digits than its factorization.

1685072993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10733106.

The product of its (nonzero) digits is 816480, while the sum is 50.

The square root of 1685072993 is about 41049.6405952598. The cubic root of 1685072993 is about 1189.9797546164.

The spelling of 1685072993 in words is "one billion, six hundred eighty-five million, seventy-two thousand, nine hundred ninety-three".