1663504 has 10 divisors (see below), whose sum is σ = 3223070. Its totient is φ = 831744.

The previous prime is 1663481. The next prime is 1663513. The reversal of 1663504 is 4053661.

It can be written as a sum of positive squares in only one way, i.e., 1327104 + 336400 = 1152^2 + 580^2 .

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 51969 + ... + 52000.

It is an arithmetic number, because the mean of its divisors is an integer number (322307).

2^1663504 is an apocalyptic number.

It is an amenable number.

1663504 is a deficient number, since it is larger than the sum of its proper divisors (1559566).

1663504 is a wasteful number, since it uses less digits than its factorization.

1663504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103977 (or 103971 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 1663504 is about 1289.7689715604. The cubic root of 1663504 is about 118.4880675434.

It can be divided in two parts, 16 and 63504, that multiplied together give a square (1016064 = 1008²).

The spelling of 1663504 in words is "one million, six hundred sixty-three thousand, five hundred four".