1338240 has 128 divisors (see below), whose sum is σ = 4626720. Its totient is φ = 327680.

The previous prime is 1338229. The next prime is 1338241. The reversal of 1338240 is 428331.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1338241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32620 + ... + 32660.

2^1338240 is an apocalyptic number.

1338240 is a gapful number since it is divisible by the number (10) 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 1338240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2313360).

1338240 is an abundant number, since it is smaller than the sum of its proper divisors (3288480).

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

1338240 is a wasteful number, since it uses less digits than its factorization.

1338240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80 (or 68 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 1338240 is about 1156.8232362812. The cubic root of 1338240 is about 110.1990884891.

Subtracting from 1338240 its reverse (428331), we obtain a palindrome (909909).

The spelling of 1338240 in words is "one million, three hundred thirty-eight thousand, two hundred forty".