1236978987 has 8 divisors (see below), whose sum is σ = 1649545536. Its totient is φ = 824532552.

The previous prime is 1236978961. The next prime is 1236978997. The reversal of 1236978987 is 7898796321.

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

It is not a de Polignac number, because 1236978987 - 2¹⁶ = 1236913451 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1236978987.

It is not an unprimeable number, because it can be changed into a prime (1236978917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2353 + ... + 49794.

It is an arithmetic number, because the mean of its divisors is an integer number (206193192).

Almost surely, 2^1236978987 is an apocalyptic number.

1236978987 is a deficient number, since it is larger than the sum of its proper divisors (412566549).

1236978987 is an equidigital number, since it uses as much as digits as its factorization.

1236978987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60057.

The product of its digits is 9144576, while the sum is 60.

The square root of 1236978987 is about 35170.7120627377. The cubic root of 1236978987 is about 1073.4638920716.

The spelling of 1236978987 in words is "one billion, two hundred thirty-six million, nine hundred seventy-eight thousand, nine hundred eighty-seven".