1181097720 has 256 divisors, whose sum is σ = 4412620800. Its totient is φ = 278484480.

The previous prime is 1181097667. The next prime is 1181097769. The reversal of 1181097720 is 277901811.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 438217 + ... + 440903.

It is an arithmetic number, because the mean of its divisors is an integer number (17236800).

Almost surely, 2^1181097720 is an apocalyptic number.

1181097720 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 1181097720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2206310400).

1181097720 is an abundant number, since it is smaller than the sum of its proper divisors (3231523080).

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

1181097720 is a wasteful number, since it uses less digits than its factorization.

1181097720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2755 (or 2745 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 36.

The square root of 1181097720 is about 34367.1022927450. The cubic root of 1181097720 is about 1057.0493829835.

The spelling of 1181097720 in words is "one billion, one hundred eighty-one million, ninety-seven thousand, seven hundred twenty".