1128438 has 16 divisors (see below), whose sum is σ = 2507760. Its totient is φ = 376128.

The previous prime is 1128433. The next prime is 1128451. The reversal of 1128438 is 8348211.

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 (1128433) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 10395 + ... + 10502.

It is an arithmetic number, because the mean of its divisors is an integer number (156735).

2^1128438 is an apocalyptic number.

1128438 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1128438 is an abundant number, since it is smaller than the sum of its proper divisors (1379322).

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

1128438 is a wasteful number, since it uses less digits than its factorization.

1128438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20908 (or 20902 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 1128438 is about 1062.2796242045. The cubic root of 1128438 is about 104.1100290149.

The spelling of 1128438 in words is "one million, one hundred twenty-eight thousand, four hundred thirty-eight".