1289671387 has 8 divisors (see below), whose sum is σ = 1348876800. Its totient is φ = 1230727080.

The previous prime is 1289671337. The next prime is 1289671421. The reversal of 1289671387 is 7831769821.

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 1289671387 - 2¹⁵ = 1289638619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1289671337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55137 + ... + 74962.

It is an arithmetic number, because the mean of its divisors is an integer number (168609600).

Almost surely, 2^1289671387 is an apocalyptic number.

1289671387 is a deficient number, since it is larger than the sum of its proper divisors (59205413).

1289671387 is a wasteful number, since it uses less digits than its factorization.

1289671387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130553.

The product of its digits is 1016064, while the sum is 52.

The square root of 1289671387 is about 35911.9950295163. The cubic root of 1289671387 is about 1088.4947904823.

The spelling of 1289671387 in words is "one billion, two hundred eighty-nine million, six hundred seventy-one thousand, three hundred eighty-seven".