1387765138 has 8 divisors (see below), whose sum is σ = 2087545788. Its totient is φ = 691916544.

The previous prime is 1387765133. The next prime is 1387765147. The reversal of 1387765138 is 8315677831.

It can be written as a sum of positive squares in 2 ways, for example, as 1366263369 + 21501769 = 36963^2 + 4637^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 1387765091 and 1387765100.

It is not an unprimeable number, because it can be changed into a prime (1387765133) 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 3 ways as a sum of consecutive naturals, for example, 982131 + ... + 983542.

Almost surely, 2^1387765138 is an apocalyptic number.

1387765138 is a deficient number, since it is larger than the sum of its proper divisors (699780650).

1387765138 is a wasteful number, since it uses less digits than its factorization.

1387765138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1966028.

The product of its digits is 846720, while the sum is 49.

The square root of 1387765138 is about 37252.7198738562. The cubic root of 1387765138 is about 1115.4205919291.

The spelling of 1387765138 in words is "one billion, three hundred eighty-seven million, seven hundred sixty-five thousand, one hundred thirty-eight".