1191392880 has 80 divisors (see below), whose sum is σ = 3697825824. Its totient is φ = 317317120.

The previous prime is 1191392879. The next prime is 1191392911. The reversal of 1191392880 is 882931911.

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

It is a congruent number.

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, 231940 + ... + 237020.

Almost surely, 2^1191392880 is an apocalyptic number.

1191392880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1191392880 is an abundant number, since it is smaller than the sum of its proper divisors (2506432944).

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

1191392880 is a wasteful number, since it uses less digits than its factorization.

1191392880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6074 (or 6068 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 42.

The square root of 1191392880 is about 34516.5595040989. The cubic root of 1191392880 is about 1060.1117954949. Note that the first 3 decimals are identical.

The spelling of 1191392880 in words is "one billion, one hundred ninety-one million, three hundred ninety-two thousand, eight hundred eighty".