1663674 has 8 divisors (see below), whose sum is σ = 3327360. Its totient is φ = 554556.

The previous prime is 1663619. The next prime is 1663681. The reversal of 1663674 is 4763661.

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

1663674 is an admirable number.

It is a super-2 number, since 2×1663674² = 5535622356552, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

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, 138634 + ... + 138645.

It is an arithmetic number, because the mean of its divisors is an integer number (415920).

2^1663674 is an apocalyptic number.

1663674 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1663674 is a wasteful number, since it uses less digits than its factorization.

1663674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277284.

The product of its digits is 18144, while the sum is 33.

The square root of 1663674 is about 1289.8348731524. The cubic root of 1663674 is about 118.4921036594.

The spelling of 1663674 in words is "one million, six hundred sixty-three thousand, six hundred seventy-four".