1663207 has 16 divisors (see below), whose sum is σ = 2094400. Its totient is φ = 1312416.

The previous prime is 1663183. The next prime is 1663217. The reversal of 1663207 is 7023661.

It is not a de Polignac number, because 1663207 - 2¹¹ = 1661159 is a prime.

1663207 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663217) 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 15 ways as a sum of consecutive naturals, for example, 4273 + ... + 4645.

It is an arithmetic number, because the mean of its divisors is an integer number (130900).

2^1663207 is an apocalyptic number.

1663207 is a deficient number, since it is larger than the sum of its proper divisors (431193).

1663207 is an equidigital number, since it uses as much as digits as its factorization.

1663207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407 (or 393 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 1663207 is about 1289.6538295217. The cubic root of 1663207 is about 118.4810155514.

Adding to 1663207 its reverse (7023661), we get a palindrome (8686868).

The spelling of 1663207 in words is "one million, six hundred sixty-three thousand, two hundred seven".