1181998792 has 64 divisors (see below), whose sum is σ = 2488812480. Its totient is φ = 522692352.

The previous prime is 1181998787. The next prime is 1181998793. The reversal of 1181998792 is 2978991811.

It is a super-2 number, since 2×1181998792² = 2794242288578918528, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1181998793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 234523 + ... + 239509.

It is an arithmetic number, because the mean of its divisors is an integer number (38887695).

Almost surely, 2^1181998792 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1181998792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1244406240).

1181998792 is an abundant number, since it is smaller than the sum of its proper divisors (1306813688).

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

1181998792 is a wasteful number, since it uses less digits than its factorization.

1181998792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5102 (or 5098 counting only the distinct ones).

The product of its digits is 653184, while the sum is 55.

The square root of 1181998792 is about 34380.2093070999. The cubic root of 1181998792 is about 1057.3181260547.

The spelling of 1181998792 in words is "one billion, one hundred eighty-one million, nine hundred ninety-eight thousand, seven hundred ninety-two".