1191432880 has 40 divisors (see below), whose sum is σ = 3021909264. Its totient is φ = 433248000.

The previous prime is 1191432877. The next prime is 1191432883. The reversal of 1191432880 is 882341911.

It is an interprime number because it is at equal distance from previous prime (1191432877) and next prime (1191432883).

It is a tau number, because it is divible by the number of its divisors (40).

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1191432883) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 676071 + ... + 677830.

Almost surely, 2^1191432880 is an apocalyptic number.

1191432880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1191432880 is an abundant number, since it is smaller than the sum of its proper divisors (1830476384).

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

1191432880 is a wasteful number, since it uses less digits than its factorization.

1191432880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1353925 (or 1353919 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 1191432880 is about 34517.1389312614. The cubic root of 1191432880 is about 1060.1236594786.

The spelling of 1191432880 in words is "one billion, one hundred ninety-one million, four hundred thirty-two thousand, eight hundred eighty".