1388844 has 36 divisors (see below), whose sum is σ = 3546816. Its totient is φ = 458208.

The previous prime is 1388837. The next prime is 1388873. The reversal of 1388844 is 4488831.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a junction number, because it is equal to n+sod(n) for n = 1388799 and 1388808.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6117 + ... + 6339.

2^1388844 is an apocalyptic number.

It is an amenable number.

1388844 is an abundant number, since it is smaller than the sum of its proper divisors (2157972).

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

1388844 is a wasteful number, since it uses less digits than its factorization.

1388844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406 (or 401 counting only the distinct ones).

The product of its digits is 24576, while the sum is 36.

The square root of 1388844 is about 1178.4922570811. The cubic root of 1388844 is about 111.5709563300.

The spelling of 1388844 in words is "one million, three hundred eighty-eight thousand, eight hundred forty-four".