1191049920 has 504 divisors, whose sum is σ = 4598206704. Its totient is φ = 293289984.

The previous prime is 1191049919. The next prime is 1191049957. The reversal of 1191049920 is 299401911.

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

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 22472614 + ... + 22472666.

It is an arithmetic number, because the mean of its divisors is an integer number (9123426).

Almost surely, 2^1191049920 is an apocalyptic number.

1191049920 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 1191049920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2299103352).

1191049920 is an abundant number, since it is smaller than the sum of its proper divisors (3407156784).

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

1191049920 is an equidigital number, since it uses as much as digits as its factorization.

1191049920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119 (or 80 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The square root of 1191049920 is about 34511.5910963259. The cubic root of 1191049920 is about 1060.0100627976.

The spelling of 1191049920 in words is "one billion, one hundred ninety-one million, forty-nine thousand, nine hundred twenty".