1288091387 has 8 divisors (see below), whose sum is σ = 1412956272. Its totient is φ = 1164520800.

The previous prime is 1288091327. The next prime is 1288091401. The reversal of 1288091387 is 7831908821.

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 1288091387 - 2¹² = 1288087291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1288091317) 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, 321488 + ... + 325469.

It is an arithmetic number, because the mean of its divisors is an integer number (176619534).

Almost surely, 2^1288091387 is an apocalyptic number.

1288091387 is a deficient number, since it is larger than the sum of its proper divisors (124864885).

1288091387 is a wasteful number, since it uses less digits than its factorization.

1288091387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 647149.

The product of its (nonzero) digits is 193536, while the sum is 47.

The square root of 1288091387 is about 35889.9900668696. The cubic root of 1288091387 is about 1088.0500972080.

The spelling of 1288091387 in words is "one billion, two hundred eighty-eight million, ninety-one thousand, three hundred eighty-seven".