1187733987 has 24 divisors (see below), whose sum is σ = 1873118208. Its totient is φ = 719247600.

The previous prime is 1187733983. The next prime is 1187734013. The reversal of 1187733987 is 7893377811.

It is a happy number.

1187733987 is a `hidden beast` number, since 1 + 187 + 73 + 398 + 7 = 666.

1187733987 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1187733987 - 2² = 1187733983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1187733983) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 136662 + ... + 145092.

It is an arithmetic number, because the mean of its divisors is an integer number (78046592).

Almost surely, 2^1187733987 is an apocalyptic number.

1187733987 is a deficient number, since it is larger than the sum of its proper divisors (685384221).

1187733987 is a wasteful number, since it uses less digits than its factorization.

1187733987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9871 (or 9868 counting only the distinct ones).

The product of its digits is 1778112, while the sum is 54.

The square root of 1187733987 is about 34463.5167532276. The cubic root of 1187733987 is about 1059.0254443137.

It can be divided in two parts, 118773 and 3987, that added together give a triangular number (122760 = T₄₉₅).

The spelling of 1187733987 in words is "one billion, one hundred eighty-seven million, seven hundred thirty-three thousand, nine hundred eighty-seven".