1662879 has 4 divisors (see below), whose sum is σ = 2217176. Its totient is φ = 1108584.

The previous prime is 1662863. The next prime is 1662883. The reversal of 1662879 is 9782661.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1662879 - 2⁴ = 1662863 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1662839) 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, 277144 + ... + 277149.

It is an arithmetic number, because the mean of its divisors is an integer number (554294).

2^1662879 is an apocalyptic number.

1662879 is a deficient number, since it is larger than the sum of its proper divisors (554297).

1662879 is an equidigital number, since it uses as much as digits as its factorization.

1662879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554296.

The product of its digits is 36288, while the sum is 39.

The square root of 1662879 is about 1289.5266573437. The cubic root of 1662879 is about 118.4732265174.

The spelling of 1662879 in words is "one million, six hundred sixty-two thousand, eight hundred seventy-nine".