1388728 has 32 divisors (see below), whose sum is σ = 2914560. Its totient is φ = 614880.

The previous prime is 1388719. The next prime is 1388743. The reversal of 1388728 is 8278831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3601 + ... + 3967.

It is an arithmetic number, because the mean of its divisors is an integer number (91080).

2^1388728 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 1388728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1457280).

1388728 is an abundant number, since it is smaller than the sum of its proper divisors (1525832).

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

1388728 is a wasteful number, since it uses less digits than its factorization.

1388728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427 (or 423 counting only the distinct ones).

The product of its digits is 21504, while the sum is 37.

The square root of 1388728 is about 1178.4430406261. The cubic root of 1388728 is about 111.5678500077.

It can be divided in two parts, 1388 and 728, that added together give a square (2116 = 46²).

The spelling of 1388728 in words is "one million, three hundred eighty-eight thousand, seven hundred twenty-eight".