1663279 has 4 divisors (see below), whose sum is σ = 1750840. Its totient is φ = 1575720.

The previous prime is 1663273. The next prime is 1663289. The reversal of 1663279 is 9723661.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1663279 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 (1663273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43752 + ... + 43789.

It is an arithmetic number, because the mean of its divisors is an integer number (437710).

2^1663279 is an apocalyptic number.

1663279 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1663279 is a deficient number, since it is larger than the sum of its proper divisors (87561).

1663279 is an equidigital number, since it uses as much as digits as its factorization.

1663279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87560.

The product of its digits is 13608, while the sum is 34.

The square root of 1663279 is about 1289.6817436872. The cubic root of 1663279 is about 118.4827252023.

The spelling of 1663279 in words is "one million, six hundred sixty-three thousand, two hundred seventy-nine".