1638063 has 32 divisors (see below), whose sum is σ = 2833920. Its totient is φ = 927288.

The previous prime is 1638061. The next prime is 1638067. The reversal of 1638063 is 3608361.

It is not a de Polignac number, because 1638063 - 2¹ = 1638061 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1638061) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15256 + ... + 15362.

It is an arithmetic number, because the mean of its divisors is an integer number (88560).

2^1638063 is an apocalyptic number.

1638063 is a deficient number, since it is larger than the sum of its proper divisors (1195857).

1638063 is an frugal number, since it uses more digits than its factorization.

1638063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135 (or 117 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 1638063 is about 1279.8683526051. The cubic root of 1638063 is about 117.8809245988.

The spelling of 1638063 in words is "one million, six hundred thirty-eight thousand, sixty-three".