1386821871 has 16 divisors (see below), whose sum is σ = 2055124320. Its totient is φ = 924289920.

The previous prime is 1386821861. The next prime is 1386821873. The reversal of 1386821871 is 1781286831.

It is a happy number.

It is not a de Polignac number, because 1386821871 - 2⁷ = 1386821743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1386821873) 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 15 ways as a sum of consecutive naturals, for example, 188661 + ... + 195873.

It is an arithmetic number, because the mean of its divisors is an integer number (128445270).

Almost surely, 2^1386821871 is an apocalyptic number.

1386821871 is a deficient number, since it is larger than the sum of its proper divisors (668302449).

1386821871 is an equidigital number, since it uses as much as digits as its factorization.

1386821871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14343 (or 14337 counting only the distinct ones).

The product of its digits is 129024, while the sum is 45.

The square root of 1386821871 is about 37240.0573442093. The cubic root of 1386821871 is about 1115.1678167111.

The spelling of 1386821871 in words is "one billion, three hundred eighty-six million, eight hundred twenty-one thousand, eight hundred seventy-one".