1680343279 has 4 divisors (see below), whose sum is σ = 1680884800. Its totient is φ = 1679801760.

The previous prime is 1680343253. The next prime is 1680343283. The reversal of 1680343279 is 9723430861.

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 1680343279 - 2⁷ = 1680343151 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 (1680343879) 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, 266079 + ... + 272320.

It is an arithmetic number, because the mean of its divisors is an integer number (420221200).

Almost surely, 2^1680343279 is an apocalyptic number.

1680343279 is a deficient number, since it is larger than the sum of its proper divisors (541521).

1680343279 is an equidigital number, since it uses as much as digits as its factorization.

1680343279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541520.

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 1680343279 is about 40991.9904249598. The cubic root of 1680343279 is about 1188.8653542282.

The spelling of 1680343279 in words is "one billion, six hundred eighty million, three hundred forty-three thousand, two hundred seventy-nine".