1680279 has 4 divisors (see below), whose sum is σ = 2240376. Its totient is φ = 1120184.

The previous prime is 1680277. The next prime is 1680313. The reversal of 1680279 is 9720861.

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 1680279 - 2¹ = 1680277 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1680271) 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, 280044 + ... + 280049.

It is an arithmetic number, because the mean of its divisors is an integer number (560094).

2^1680279 is an apocalyptic number.

1680279 is a deficient number, since it is larger than the sum of its proper divisors (560097).

1680279 is an equidigital number, since it uses as much as digits as its factorization.

1680279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560096.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 1680279 is about 1296.2557618001. The cubic root of 1680279 is about 118.8850194617.

The spelling of 1680279 in words is "one million, six hundred eighty thousand, two hundred seventy-nine".