1181012240 has 80 divisors (see below), whose sum is σ = 2901242880. Its totient is φ = 446369280.

The previous prime is 1181012233. The next prime is 1181012251. The reversal of 1181012240 is 422101811.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×1181012240² = 2789579822059635200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103625 + ... + 114455.

It is an arithmetic number, because the mean of its divisors is an integer number (36265536).

Almost surely, 2^1181012240 is an apocalyptic number.

1181012240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1181012240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1450621440).

1181012240 is an abundant number, since it is smaller than the sum of its proper divisors (1720230640).

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

1181012240 is a wasteful number, since it uses less digits than its factorization.

1181012240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10920 (or 10914 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

The square root of 1181012240 is about 34365.8586390621. The cubic root of 1181012240 is about 1057.0238816329.

The spelling of 1181012240 in words is "one billion, one hundred eighty-one million, twelve thousand, two hundred forty".