1187639063 has 8 divisors (see below), whose sum is σ = 1334604768. Its totient is φ = 1048617504.

The previous prime is 1187639053. The next prime is 1187639093. The reversal of 1187639063 is 3609367811.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1187639063 - 2¹⁸ = 1187376919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1187639003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1985720 + ... + 1986317.

It is an arithmetic number, because the mean of its divisors is an integer number (166825596).

Almost surely, 2^1187639063 is an apocalyptic number.

1187639063 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1187639063 is a deficient number, since it is larger than the sum of its proper divisors (146965705).

1187639063 is a wasteful number, since it uses less digits than its factorization.

1187639063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3972073.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 1187639063 is about 34462.1395592322. The cubic root of 1187639063 is about 1058.9972310352.

The spelling of 1187639063 in words is "one billion, one hundred eighty-seven million, six hundred thirty-nine thousand, sixty-three".