1118265820 has 24 divisors (see below), whose sum is σ = 2683838304. Its totient is φ = 383405376.

The previous prime is 1118265817. The next prime is 1118265829. The reversal of 1118265820 is 285628111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1118265829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3993667 + ... + 3993946.

It is an arithmetic number, because the mean of its divisors is an integer number (111826596).

Almost surely, 2^1118265820 is an apocalyptic number.

1118265820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1118265820 is an abundant number, since it is smaller than the sum of its proper divisors (1565572484).

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

1118265820 is a wasteful number, since it uses less digits than its factorization.

1118265820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7987629 (or 7987627 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 34.

The square root of 1118265820 is about 33440.4817549030. The cubic root of 1118265820 is about 1037.9625482878.

The spelling of 1118265820 in words is "one billion, one hundred eighteen million, two hundred sixty-five thousand, eight hundred twenty".