1663744 has 36 divisors (see below), whose sum is σ = 3405304. Its totient is φ = 811008.

The previous prime is 1663721. The next prime is 1663747. The reversal of 1663744 is 4473661.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1663747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17104 + ... + 17200.

2^1663744 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1663744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1702652).

1663744 is an abundant number, since it is smaller than the sum of its proper divisors (1741560).

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

1663744 is an frugal number, since it uses more digits than its factorization.

1663744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180 (or 166 counting only the distinct ones).

The product of its digits is 12096, while the sum is 31.

The square root of 1663744 is about 1289.8620081233. The cubic root of 1663744 is about 118.4937655096.

The spelling of 1663744 in words is "one million, six hundred sixty-three thousand, seven hundred forty-four".