1387320705 has 48 divisors (see below), whose sum is σ = 2501928000. Its totient is φ = 710279808.

The previous prime is 1387320691. The next prime is 1387320707. The reversal of 1387320705 is 5070237831.

It is not a de Polignac number, because 1387320705 - 2⁷ = 1387320577 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1387320705.

It is not an unprimeable number, because it can be changed into a prime (1387320707) 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 47 ways as a sum of consecutive naturals, for example, 230626 + ... + 236564.

It is an arithmetic number, because the mean of its divisors is an integer number (52123500).

Almost surely, 2^1387320705 is an apocalyptic number.

1387320705 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1387320705 is a deficient number, since it is larger than the sum of its proper divisors (1114607295).

1387320705 is a wasteful number, since it uses less digits than its factorization.

1387320705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6158 (or 6155 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The square root of 1387320705 is about 37246.7542881256. The cubic root of 1387320705 is about 1115.3015077423.

The spelling of 1387320705 in words is "one billion, three hundred eighty-seven million, three hundred twenty thousand, seven hundred five".