1663005 has 16 divisors (see below), whose sum is σ = 2753280. Its totient is φ = 856128.

The previous prime is 1662979. The next prime is 1663009. The reversal of 1663005 is 5003661.

1663005 = 140² + 141² + ... + 197².

It is not a de Polignac number, because 1663005 - 2¹¹ = 1660957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1477 + ... + 2346.

It is an arithmetic number, because the mean of its divisors is an integer number (172080).

2^1663005 is an apocalyptic number.

1663005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1663005 is a deficient number, since it is larger than the sum of its proper divisors (1090275).

1663005 is a wasteful number, since it uses less digits than its factorization.

1663005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3860.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 1663005 is about 1289.5755115541. The cubic root of 1663005 is about 118.4762187674.

Adding to 1663005 its reverse (5003661), we get a palindrome (6666666).

The spelling of 1663005 in words is "one million, six hundred sixty-three thousand, five".