1388889 has 6 divisors (see below), whose sum is σ = 2006186. Its totient is φ = 925920.

The previous prime is 1388887. The next prime is 1388927. The reversal of 1388889 is 9888831.

It can be written as a sum of positive squares in only one way, i.e., 870489 + 518400 = 933^2 + 720^2 .

It is not a de Polignac number, because 1388889 - 2¹ = 1388887 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (1388887) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 77152 + ... + 77169.

2^1388889 is an apocalyptic number.

It is an amenable number.

1388889 is a deficient number, since it is larger than the sum of its proper divisors (617297).

1388889 is a wasteful number, since it uses less digits than its factorization.

1388889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154327 (or 154324 counting only the distinct ones).

The product of its digits is 110592, while the sum is 45.

The square root of 1388889 is about 1178.5113491180. The cubic root of 1388889 is about 111.5721613223.

The spelling of 1388889 in words is "one million, three hundred eighty-eight thousand, eight hundred eighty-nine".