1121856828 has 12 divisors (see below), whose sum is σ = 2617665960. Its totient is φ = 373952272.

The previous prime is 1121856811. The next prime is 1121856839. The reversal of 1121856828 is 8286581211.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 1121856828.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46744023 + ... + 46744046.

It is an arithmetic number, because the mean of its divisors is an integer number (218138830).

Almost surely, 2^1121856828 is an apocalyptic number.

It is an amenable number.

1121856828 is an abundant number, since it is smaller than the sum of its proper divisors (1495809132).

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

1121856828 is a wasteful number, since it uses less digits than its factorization.

1121856828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93488076 (or 93488074 counting only the distinct ones).

The product of its digits is 61440, while the sum is 42.

The square root of 1121856828 is about 33494.1312471304. The cubic root of 1121856828 is about 1039.0724063908.

The spelling of 1121856828 in words is "one billion, one hundred twenty-one million, eight hundred fifty-six thousand, eight hundred twenty-eight".