1663387 has 12 divisors (see below), whose sum is σ = 1867320. Its totient is φ = 1480160.

The previous prime is 1663381. The next prime is 1663391. The reversal of 1663387 is 7833661.

It is not a de Polignac number, because 1663387 - 2³ = 1663379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1663381) 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 11 ways as a sum of consecutive naturals, for example, 7023 + ... + 7255.

It is an arithmetic number, because the mean of its divisors is an integer number (155610).

2^1663387 is an apocalyptic number.

1663387 is a deficient number, since it is larger than the sum of its proper divisors (203933).

1663387 is a wasteful number, since it uses less digits than its factorization.

1663387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314 (or 303 counting only the distinct ones).

The product of its digits is 18144, while the sum is 34.

The square root of 1663387 is about 1289.7236138026. The cubic root of 1663387 is about 118.4852895862.

It can be divided in two parts, 166 and 3387, that added together give a palindrome (3553).

The spelling of 1663387 in words is "one million, six hundred sixty-three thousand, three hundred eighty-seven".