1388816 has 40 divisors (see below), whose sum is σ = 3166464. Its totient is φ = 581760.

The previous prime is 1388797. The next prime is 1388819. The reversal of 1388816 is 6188831.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1388819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1985 + ... + 2591.

2^1388816 is an apocalyptic number.

1388816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1388816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1583232).

1388816 is an abundant number, since it is smaller than the sum of its proper divisors (1777648).

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

1388816 is a wasteful number, since it uses less digits than its factorization.

1388816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639 (or 633 counting only the distinct ones).

The product of its digits is 9216, while the sum is 35.

The square root of 1388816 is about 1178.4803774353. The cubic root of 1388816 is about 111.5702065439.

The spelling of 1388816 in words is "one million, three hundred eighty-eight thousand, eight hundred sixteen".