1685340407 has 4 divisors (see below), whose sum is σ = 1784478096. Its totient is φ = 1586202720.

The previous prime is 1685340361. The next prime is 1685340443. The reversal of 1685340407 is 7040435861.

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

It is a cyclic number.

It is not a de Polignac number, because 1685340407 - 2²⁰ = 1684291831 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 (1685340457) 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, 49568819 + ... + 49568852.

It is an arithmetic number, because the mean of its divisors is an integer number (446119524).

Almost surely, 2^1685340407 is an apocalyptic number.

1685340407 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1685340407 is a deficient number, since it is larger than the sum of its proper divisors (99137689).

1685340407 is an equidigital number, since it uses as much as digits as its factorization.

1685340407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99137688.

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 1685340407 is about 41052.8976687395. The cubic root of 1685340407 is about 1190.0426995483.

The spelling of 1685340407 in words is "one billion, six hundred eighty-five million, three hundred forty thousand, four hundred seven".