1388645 has 18 divisors (see below), whose sum is σ = 1829106. Its totient is φ = 1011840.

The previous prime is 1388641. The next prime is 1388659. The reversal of 1388645 is 5468831.

It can be written as a sum of positive squares in 3 ways, for example, as 465124 + 923521 = 682^2 + 961^2 .

It is not a de Polignac number, because 1388645 - 2² = 1388641 is a prime.

It is a super-3 number, since 3×1388645³ = 8033318001709308375, which contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1388641) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 44780 + ... + 44810.

It is an arithmetic number, because the mean of its divisors is an integer number (101617).

2^1388645 is an apocalyptic number.

It is an amenable number.

1388645 is a deficient number, since it is larger than the sum of its proper divisors (440461).

1388645 is an equidigital number, since it uses as much as digits as its factorization.

1388645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101 (or 53 counting only the distinct ones).

The product of its digits is 23040, while the sum is 35.

The square root of 1388645 is about 1178.4078241424. The cubic root of 1388645 is about 111.5656272744.

It can be divided in two parts, 13886 and 45, that added together give a palindrome (13931).

The spelling of 1388645 in words is "one million, three hundred eighty-eight thousand, six hundred forty-five".