1003638 has 16 divisors (see below), whose sum is σ = 2050560. Its totient is φ = 327336.

The previous prime is 1003631. The next prime is 1003679. The reversal of 1003638 is 8363001.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1003631) 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 7 ways as a sum of consecutive naturals, for example, 1498 + ... + 2061.

It is an arithmetic number, because the mean of its divisors is an integer number (128160).

2^1003638 is an apocalyptic number.

1003638 is an abundant number, since it is smaller than the sum of its proper divisors (1046922).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1003638 is a wasteful number, since it uses less digits than its factorization.

1003638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3611.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 1003638 is about 1001.8173486220. The cubic root of 1003638 is about 100.1211199071.

Adding to 1003638 its reverse (8363001), we get a palindrome (9366639).

The spelling of 1003638 in words is "one million, three thousand, six hundred thirty-eight".