1118193912 has 72 divisors (see below), whose sum is σ = 3328809120. Its totient is φ = 338844000.

The previous prime is 1118193911. The next prime is 1118193917. The reversal of 1118193912 is 2193918111.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1118193911) 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 17 ways as a sum of consecutive naturals, for example, 55464 + ... + 72887.

It is an arithmetic number, because the mean of its divisors is an integer number (46233460).

Almost surely, 2^1118193912 is an apocalyptic number.

1118193912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1118193912 is an abundant number, since it is smaller than the sum of its proper divisors (2210615208).

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

1118193912 is a wasteful number, since it uses less digits than its factorization.

1118193912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128385 (or 128367 counting only the distinct ones).

The product of its digits is 3888, while the sum is 36.

The square root of 1118193912 is about 33439.4065736819. The cubic root of 1118193912 is about 1037.9402997283.

The spelling of 1118193912 in words is "one billion, one hundred eighteen million, one hundred ninety-three thousand, nine hundred twelve".