1660279 has 4 divisors (see below), whose sum is σ = 1717560. Its totient is φ = 1603000.

The previous prime is 1660261. The next prime is 1660283. The reversal of 1660279 is 9720661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9720661 = 97 ⋅100213.

It is a cyclic number.

It is not a de Polignac number, because 1660279 - 2⁵ = 1660247 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1660279.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660229) 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 3 ways as a sum of consecutive naturals, for example, 28597 + ... + 28654.

It is an arithmetic number, because the mean of its divisors is an integer number (429390).

2^1660279 is an apocalyptic number.

1660279 is a deficient number, since it is larger than the sum of its proper divisors (57281).

1660279 is an equidigital number, since it uses as much as digits as its factorization.

1660279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57280.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 1660279 is about 1288.5181411218. The cubic root of 1660279 is about 118.4114479054.

The spelling of 1660279 in words is "one million, six hundred sixty thousand, two hundred seventy-nine".