1187078865 has 128 divisors (see below), whose sum is σ = 2368880640. Its totient is φ = 495652608.

The previous prime is 1187078861. The next prime is 1187078887. The reversal of 1187078865 is 5688707811.

It is not a de Polignac number, because 1187078865 - 2² = 1187078861 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1187078861) 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 127 ways as a sum of consecutive naturals, for example, 11094142 + ... + 11094248.

It is an arithmetic number, because the mean of its divisors is an integer number (18506880).

Almost surely, 2^1187078865 is an apocalyptic number.

1187078865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1187078865 is a deficient number, since it is larger than the sum of its proper divisors (1181801775).

1187078865 is a wasteful number, since it uses less digits than its factorization.

1187078865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291.

The product of its (nonzero) digits is 752640, while the sum is 51.

The square root of 1187078865 is about 34454.0108695635. The cubic root of 1187078865 is about 1058.8306985562.

The spelling of 1187078865 in words is "one billion, one hundred eighty-seven million, seventy-eight thousand, eight hundred sixty-five".