1388244 has 48 divisors (see below), whose sum is σ = 3810240. Its totient is φ = 387840.

The previous prime is 1388243. The next prime is 1388269. The reversal of 1388244 is 4428831.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1388243) 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 15 ways as a sum of consecutive naturals, for example, 1312 + ... + 2120.

It is an arithmetic number, because the mean of its divisors is an integer number (79380).

2^1388244 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 1388244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1905120).

1388244 is an abundant number, since it is smaller than the sum of its proper divisors (2421996).

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

1388244 is a wasteful number, since it uses less digits than its factorization.

1388244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 840 (or 838 counting only the distinct ones).

The product of its digits is 6144, while the sum is 30.

The square root of 1388244 is about 1178.2376670265. The cubic root of 1388244 is about 111.5548872788.

The spelling of 1388244 in words is "one million, three hundred eighty-eight thousand, two hundred forty-four".