1187788867 has 4 divisors (see below), whose sum is σ = 1190751336. Its totient is φ = 1184826400.

The previous prime is 1187788859. The next prime is 1187788907. The reversal of 1187788867 is 7688877811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7688877811 = 59183 ⋅129917.

It is a cyclic number.

It is not a de Polignac number, because 1187788867 - 2³ = 1187788859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1187788807) 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 3 ways as a sum of consecutive naturals, for example, 1480633 + ... + 1481434.

It is an arithmetic number, because the mean of its divisors is an integer number (297687834).

Almost surely, 2^1187788867 is an apocalyptic number.

1187788867 is a deficient number, since it is larger than the sum of its proper divisors (2962469).

1187788867 is an equidigital number, since it uses as much as digits as its factorization.

1187788867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2962468.

The product of its digits is 8429568, while the sum is 61.

The square root of 1187788867 is about 34464.3129483238. The cubic root of 1187788867 is about 1059.0417550426.

The spelling of 1187788867 in words is "one billion, one hundred eighty-seven million, seven hundred eighty-eight thousand, eight hundred sixty-seven".