1680395289 has 4 divisors (see below), whose sum is σ = 2240527056. Its totient is φ = 1120263524.

The previous prime is 1680395287. The next prime is 1680395347. The reversal of 1680395289 is 9825930861.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1680395289 - 2¹ = 1680395287 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1680395281) 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, 280065879 + ... + 280065884.

It is an arithmetic number, because the mean of its divisors is an integer number (560131764).

Almost surely, 2^1680395289 is an apocalyptic number.

It is an amenable number.

1680395289 is a deficient number, since it is larger than the sum of its proper divisors (560131767).

1680395289 is an equidigital number, since it uses as much as digits as its factorization.

1680395289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560131766.

The product of its (nonzero) digits is 933120, while the sum is 51.

The square root of 1680395289 is about 40992.6248122757. The cubic root of 1680395289 is about 1188.8776200253.

The spelling of 1680395289 in words is "one billion, six hundred eighty million, three hundred ninety-five thousand, two hundred eighty-nine".