1386640871 has 16 divisors (see below), whose sum is σ = 1733544960. Its totient is φ = 1077533280.

The previous prime is 1386640861. The next prime is 1386640907. The reversal of 1386640871 is 1780466831.

It is a cyclic number.

It is not a de Polignac number, because 1386640871 - 2⁶ = 1386640807 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1386640811) 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, 3725 + ... + 52793.

It is an arithmetic number, because the mean of its divisors is an integer number (108346560).

Almost surely, 2^1386640871 is an apocalyptic number.

1386640871 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1386640871 is a deficient number, since it is larger than the sum of its proper divisors (346904089).

1386640871 is a wasteful number, since it uses less digits than its factorization.

1386640871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49454.

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 1386640871 is about 37237.6270860537. The cubic root of 1386640871 is about 1115.1192995076.

The spelling of 1386640871 in words is "one billion, three hundred eighty-six million, six hundred forty thousand, eight hundred seventy-one".