1389388 has 48 divisors (see below), whose sum is σ = 3273984. Its totient is φ = 498240.

The previous prime is 1389383. The next prime is 1389403. The reversal of 1389388 is 8839831.

It is a self number, because there is not a number n which added to its sum of digits gives 1389388.

It is not an unprimeable number, because it can be changed into a prime (1389383) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3831 + ... + 4177.

It is an arithmetic number, because the mean of its divisors is an integer number (68208).

2^1389388 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1389388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1636992).

1389388 is an abundant number, since it is smaller than the sum of its proper divisors (1884596).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1389388 is a wasteful number, since it uses less digits than its factorization.

1389388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382 (or 380 counting only the distinct ones).

The product of its digits is 41472, while the sum is 40.

The square root of 1389388 is about 1178.7230378677. The cubic root of 1389388 is about 111.5855216034.

It can be divided in two parts, 13 and 89388, that added together give a square (89401 = 299²).

The spelling of 1389388 in words is "one million, three hundred eighty-nine thousand, three hundred eighty-eight".