1387165 has 8 divisors (see below), whose sum is σ = 1792728. Its totient is φ = 1024320.

The previous prime is 1387163. The next prime is 1387189. The reversal of 1387165 is 5617831.

It can be written as a sum of positive squares in 4 ways, for example, as 301401 + 1085764 = 549^2 + 1042^2 .

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

It is not a de Polignac number, because 1387165 - 2¹ = 1387163 is a prime.

It is a Duffinian number.

1387165 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1387163) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 10606 + ... + 10735.

It is an arithmetic number, because the mean of its divisors is an integer number (224091).

2^1387165 is an apocalyptic number.

It is an amenable number.

1387165 is a deficient number, since it is larger than the sum of its proper divisors (405563).

1387165 is a wasteful number, since it uses less digits than its factorization.

1387165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21359.

The product of its digits is 5040, while the sum is 31.

The square root of 1387165 is about 1177.7796907741. The cubic root of 1387165 is about 111.5259781145.

It can be divided in two parts, 13 and 87165, that added together give a palindrome (87178).

The spelling of 1387165 in words is "one million, three hundred eighty-seven thousand, one hundred sixty-five".