1387765139 has 4 divisors (see below), whose sum is σ = 1387994160. Its totient is φ = 1387536120.

The previous prime is 1387765133. The next prime is 1387765147. The reversal of 1387765139 is 9315677831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9315677831 = 1999 ⋅4660169.

It is a cyclic number.

It is not a de Polignac number, because 1387765139 - 2⁴ = 1387765123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1387765133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105167 + ... + 117624.

It is an arithmetic number, because the mean of its divisors is an integer number (346998540).

Almost surely, 2^1387765139 is an apocalyptic number.

1387765139 is a deficient number, since it is larger than the sum of its proper divisors (229021).

1387765139 is an equidigital number, since it uses as much as digits as its factorization.

1387765139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229020.

The product of its digits is 952560, while the sum is 50.

The square root of 1387765139 is about 37252.7198872780. The cubic root of 1387765139 is about 1115.4205921970.

The spelling of 1387765139 in words is "one billion, three hundred eighty-seven million, seven hundred sixty-five thousand, one hundred thirty-nine".