1023638 has 48 divisors (see below), whose sum is σ = 2121984. Its totient is φ = 359040.

The previous prime is 1023601. The next prime is 1023643. The reversal of 1023638 is 8363201.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44495 + ... + 44517.

It is an arithmetic number, because the mean of its divisors is an integer number (44208).

2^1023638 is an apocalyptic number.

1023638 is an abundant number, since it is smaller than the sum of its proper divisors (1098346).

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

1023638 is a wasteful number, since it uses less digits than its factorization.

1023638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77 (or 60 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 1023638 is about 1011.7499691129. The cubic root of 1023638 is about 100.7818052110.

Adding to 1023638 its reverse (8363201), we get a palindrome (9386839).

It can be divided in two parts, 1023 and 638, that added together give a palindrome (1661).

The spelling of 1023638 in words is "one million, twenty-three thousand, six hundred thirty-eight".