1318639 has 12 divisors (see below), whose sum is σ = 1625184. Its totient is φ = 1063104.

The previous prime is 1318633. The next prime is 1318661. The reversal of 1318639 is 9368131.

It is not a de Polignac number, because 1318639 - 2¹¹ = 1316591 is a prime.

It is a Duffinian number.

1318639 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1318639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1318633) 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 11 ways as a sum of consecutive naturals, for example, 42 + ... + 1624.

It is an arithmetic number, because the mean of its divisors is an integer number (135432).

2^1318639 is an apocalyptic number.

1318639 is a deficient number, since it is larger than the sum of its proper divisors (306545).

1318639 is a wasteful number, since it uses less digits than its factorization.

1318639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1614 (or 1607 counting only the distinct ones).

The product of its digits is 3888, while the sum is 31.

The square root of 1318639 is about 1148.3200773304. The cubic root of 1318639 is about 109.6584169641.

It can be divided in two parts, 13186 and 39, that added together give a square (13225 = 115²).

The spelling of 1318639 in words is "one million, three hundred eighteen thousand, six hundred thirty-nine".