1123616820 has 24 divisors (see below), whose sum is σ = 3146127264. Its totient is φ = 299631136.

The previous prime is 1123616773. The next prime is 1123616833. The reversal of 1123616820 is 286163211.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9363414 + ... + 9363533.

It is an arithmetic number, because the mean of its divisors is an integer number (131088636).

Almost surely, 2^1123616820 is an apocalyptic number.

1123616820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1123616820 is an abundant number, since it is smaller than the sum of its proper divisors (2022510444).

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

1123616820 is a wasteful number, since it uses less digits than its factorization.

1123616820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18726959 (or 18726957 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 1123616820 is about 33520.3940907621. The cubic root of 1123616820 is about 1039.6154951873.

The spelling of 1123616820 in words is "one billion, one hundred twenty-three million, six hundred sixteen thousand, eight hundred twenty".