1191552420 has 48 divisors (see below), whose sum is σ = 3361837248. Its totient is φ = 315319680.

The previous prime is 1191552419. The next prime is 1191552437. The reversal of 1191552420 is 242551911.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 67939 + ... + 83658.

It is an arithmetic number, because the mean of its divisors is an integer number (70038276).

Almost surely, 2^1191552420 is an apocalyptic number.

1191552420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1191552420 is an abundant number, since it is smaller than the sum of its proper divisors (2170284828).

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

1191552420 is a wasteful number, since it uses less digits than its factorization.

1191552420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151740 (or 151738 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 30.

The square root of 1191552420 is about 34518.8704913704. The cubic root of 1191552420 is about 1060.1591134116.

The spelling of 1191552420 in words is "one billion, one hundred ninety-one million, five hundred fifty-two thousand, four hundred twenty".