1389816 has 48 divisors (see below), whose sum is σ = 3822000. Its totient is φ = 456192.

The previous prime is 1389811. The next prime is 1389833. The reversal of 1389816 is 6189831.

1389816 = 43³ + 44³ + ... + 54³.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389811) 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 11 ways as a sum of consecutive naturals, for example, 6885 + ... + 7083.

It is an arithmetic number, because the mean of its divisors is an integer number (79625).

2^1389816 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 1389816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1911000).

1389816 is an abundant number, since it is smaller than the sum of its proper divisors (2432184).

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

1389816 is a wasteful number, since it uses less digits than its factorization.

1389816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308 (or 301 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 1389816 is about 1178.9045762911. The cubic root of 1389816 is about 111.5969783743.

The spelling of 1389816 in words is "one million, three hundred eighty-nine thousand, eight hundred sixteen".