1685376009 has 6 divisors (see below), whose sum is σ = 2434432026. Its totient is φ = 1123584000.

The previous prime is 1685375999. The next prime is 1685376029. The reversal of 1685376009 is 9006735861.

It is a happy number.

1685376009 is a `hidden beast` number, since 1 + 6 + 8 + 5 + 37 + 600 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1016015625 + 669360384 = 31875^2 + 25872^2 .

It is not a de Polignac number, because 1685376009 - 2¹² = 1685371913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1685376029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 93631992 + ... + 93632009.

It is an arithmetic number, because the mean of its divisors is an integer number (405738671).

Almost surely, 2^1685376009 is an apocalyptic number.

It is an amenable number.

1685376009 is a deficient number, since it is larger than the sum of its proper divisors (749056017).

1685376009 is a wasteful number, since it uses less digits than its factorization.

1685376009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187264007 (or 187264004 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The square root of 1685376009 is about 41053.3312777416. The cubic root of 1685376009 is about 1190.0510791812.

The spelling of 1685376009 in words is "one billion, six hundred eighty-five million, three hundred seventy-six thousand, nine".