1387705 has 16 divisors (see below), whose sum is σ = 1897344. Its totient is φ = 964480.

The previous prime is 1387691. The next prime is 1387717. The reversal of 1387705 is 5077831.

It is not a de Polignac number, because 1387705 - 2¹³ = 1379513 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 717 + ... + 1813.

It is an arithmetic number, because the mean of its divisors is an integer number (118584).

2^1387705 is an apocalyptic number.

It is an amenable number.

1387705 is a deficient number, since it is larger than the sum of its proper divisors (509639).

1387705 is a wasteful number, since it uses less digits than its factorization.

1387705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1136.

The product of its (nonzero) digits is 5880, while the sum is 31.

The square root of 1387705 is about 1178.0089133788. The cubic root of 1387705 is about 111.5404479661.

The spelling of 1387705 in words is "one million, three hundred eighty-seven thousand, seven hundred five".