1387287217 has 8 divisors (see below), whose sum is σ = 1402514280. Its totient is φ = 1372089600.

The previous prime is 1387287157. The next prime is 1387287221. The reversal of 1387287217 is 7127827831.

It can be written as a sum of positive squares in 4 ways, for example, as 54745201 + 1332542016 = 7399^2 + 36504^2 .

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 1387287217 - 2⁷ = 1387287089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1387287277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95103 + ... + 108715.

It is an arithmetic number, because the mean of its divisors is an integer number (175314285).

Almost surely, 2^1387287217 is an apocalyptic number.

It is an amenable number.

1387287217 is a deficient number, since it is larger than the sum of its proper divisors (15227063).

1387287217 is a wasteful number, since it uses less digits than its factorization.

1387287217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14723.

The product of its digits is 263424, while the sum is 46.

The square root of 1387287217 is about 37246.3047428869. The cubic root of 1387287217 is about 1115.2925337257.

The spelling of 1387287217 in words is "one billion, three hundred eighty-seven million, two hundred eighty-seven thousand, two hundred seventeen".