1685407741 has 4 divisors (see below), whose sum is σ = 1685595132. Its totient is φ = 1685220352.

The previous prime is 1685407697. The next prime is 1685407751. The reversal of 1685407741 is 1477045861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1477045861 = 241 ⋅6128821.

It can be written as a sum of positive squares in 2 ways, for example, as 1650715641 + 34692100 = 40629^2 + 5890^2 .

It is a cyclic number.

It is not a de Polignac number, because 1685407741 - 2¹¹ = 1685405693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1685407751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79486 + ... + 98431.

It is an arithmetic number, because the mean of its divisors is an integer number (421398783).

Almost surely, 2^1685407741 is an apocalyptic number.

It is an amenable number.

1685407741 is a deficient number, since it is larger than the sum of its proper divisors (187391).

1685407741 is an equidigital number, since it uses as much as digits as its factorization.

1685407741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187390.

The product of its (nonzero) digits is 188160, while the sum is 43.

The square root of 1685407741 is about 41053.7177488227. The cubic root of 1685407741 is about 1190.0585478338.

The spelling of 1685407741 in words is "one billion, six hundred eighty-five million, four hundred seven thousand, seven hundred forty-one".