1663879 has 8 divisors (see below), whose sum is σ = 1911168. Its totient is φ = 1419000.

The previous prime is 1663877. The next prime is 1663891. The reversal of 1663879 is 9783661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1663879 - 2¹ = 1663877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663873) 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 7 ways as a sum of consecutive naturals, for example, 1284 + ... + 2230.

It is an arithmetic number, because the mean of its divisors is an integer number (238896).

2^1663879 is an apocalyptic number.

1663879 is a deficient number, since it is larger than the sum of its proper divisors (247289).

1663879 is an equidigital number, since it uses as much as digits as its factorization.

1663879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1205.

The product of its digits is 54432, while the sum is 40.

The square root of 1663879 is about 1289.9143382411. The cubic root of 1663879 is about 118.4969703748.

The spelling of 1663879 in words is "one million, six hundred sixty-three thousand, eight hundred seventy-nine".