1386815871 has 32 divisors (see below), whose sum is σ = 2226864640. Its totient is φ = 749948544.

The previous prime is 1386815869. The next prime is 1386815897. The reversal of 1386815871 is 1785186831.

It is not a de Polignac number, because 1386815871 - 2¹ = 1386815869 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1386815871.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1386815071) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 674481 + ... + 676533.

It is an arithmetic number, because the mean of its divisors is an integer number (69589520).

Almost surely, 2^1386815871 is an apocalyptic number.

1386815871 is a deficient number, since it is larger than the sum of its proper divisors (840048769).

1386815871 is a wasteful number, since it uses less digits than its factorization.

1386815871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3775.

The product of its digits is 322560, while the sum is 48.

The square root of 1386815871 is about 37239.9767857071. The cubic root of 1386815871 is about 1115.1662084736.

The spelling of 1386815871 in words is "one billion, three hundred eighty-six million, eight hundred fifteen thousand, eight hundred seventy-one".