1387865109 has 8 divisors (see below), whose sum is σ = 1850715040. Its totient is φ = 925129296.

The previous prime is 1387865081. The next prime is 1387865117. The reversal of 1387865109 is 9015687831.

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

It is not a de Polignac number, because 1387865109 - 2²⁵ = 1354310677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1387865189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5727 + ... + 52995.

It is an arithmetic number, because the mean of its divisors is an integer number (231339380).

Almost surely, 2^1387865109 is an apocalyptic number.

It is an amenable number.

1387865109 is a deficient number, since it is larger than the sum of its proper divisors (462849931).

1387865109 is an equidigital number, since it uses as much as digits as its factorization.

1387865109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57059.

The product of its (nonzero) digits is 362880, while the sum is 48.

The square root of 1387865109 is about 37254.0616443362. The cubic root of 1387865109 is about 1115.4473752878.

It can be divided in two parts, 13878 and 65109, that added together give a palindrome (78987).

The spelling of 1387865109 in words is "one billion, three hundred eighty-seven million, eight hundred sixty-five thousand, one hundred nine".