1387638864787 has 16 divisors (see below), whose sum is σ = 1612862046720. Its totient is φ = 1169165694528.

The previous prime is 1387638864757. The next prime is 1387638864823. The reversal of 1387638864787 is 7874688367831.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1387638864787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1387638864757) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6405223 + ... + 6618319.

It is an arithmetic number, because the mean of its divisors is an integer number (100803877920).

Almost surely, 2^{1387638864787} is an apocalyptic number.

1387638864787 is a deficient number, since it is larger than the sum of its proper divisors (225223181933).

1387638864787 is a wasteful number, since it uses less digits than its factorization.

1387638864787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228930.

The product of its digits is 1820786688, while the sum is 76.

The spelling of 1387638864787 in words is "one trillion, three hundred eighty-seven billion, six hundred thirty-eight million, eight hundred sixty-four thousand, seven hundred eighty-seven".