1128421844 has 48 divisors (see below), whose sum is σ = 2212733376. Its totient is φ = 499065600.

The previous prime is 1128421841. The next prime is 1128421891. The reversal of 1128421844 is 4481248211.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1128421841) 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 15 ways as a sum of consecutive naturals, for example, 1004267 + ... + 1005389.

It is an arithmetic number, because the mean of its divisors is an integer number (46098612).

Almost surely, 2^1128421844 is an apocalyptic number.

It is an amenable number.

1128421844 is a deficient number, since it is larger than the sum of its proper divisors (1084311532).

1128421844 is a wasteful number, since it uses less digits than its factorization.

1128421844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1736 (or 1734 counting only the distinct ones).

The product of its digits is 16384, while the sum is 35.

The square root of 1128421844 is about 33591.9907716110. The cubic root of 1128421844 is about 1041.0953216008.

The spelling of 1128421844 in words is "one billion, one hundred twenty-eight million, four hundred twenty-one thousand, eight hundred forty-four".