1685420345 has 8 divisors (see below), whose sum is σ = 2311433664. Its totient is φ = 1155716784.

The previous prime is 1685420291. The next prime is 1685420353. The reversal of 1685420345 is 5430245861.

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 1685420345 - 2⁶ = 1685420281 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1685420299 and 1685420308.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 24077399 + ... + 24077468.

It is an arithmetic number, because the mean of its divisors is an integer number (288929208).

Almost surely, 2^1685420345 is an apocalyptic number.

It is an amenable number.

1685420345 is a deficient number, since it is larger than the sum of its proper divisors (626013319).

1685420345 is an equidigital number, since it uses as much as digits as its factorization.

1685420345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48154879.

The product of its (nonzero) digits is 115200, while the sum is 38.

The square root of 1685420345 is about 41053.8712547307. The cubic root of 1685420345 is about 1190.0615143683.

The spelling of 1685420345 in words is "one billion, six hundred eighty-five million, four hundred twenty thousand, three hundred forty-five".