1388268 has 54 divisors (see below), whose sum is σ = 4087356. Its totient is φ = 396144.

The previous prime is 1388243. The next prime is 1388269. The reversal of 1388268 is 8628831.

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

It is not an unprimeable number, because it can be changed into a prime (1388269) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1371 + ... + 2157.

2^1388268 is an apocalyptic number.

1388268 is a gapful number since it is divisible by the number (18) 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 1388268, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2043678).

1388268 is an abundant number, since it is smaller than the sum of its proper divisors (2699088).

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

1388268 is a wasteful number, since it uses less digits than its factorization.

1388268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811 (or 799 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 1388268 is about 1178.2478516849. The cubic root of 1388268 is about 111.5555301297. Note that the first 4 decimals are identical.

The spelling of 1388268 in words is "one million, three hundred eighty-eight thousand, two hundred sixty-eight".