1339840 has 56 divisors (see below), whose sum is σ = 3291840. Its totient is φ = 519168.

The previous prime is 1339817. The next prime is 1339843. The reversal of 1339840 is 489331.

It is a junction number, because it is equal to n+sod(n) for n = 1339799 and 1339808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1339843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16921 + ... + 16999.

2^1339840 is an apocalyptic number.

1339840 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 1339840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1645920).

1339840 is an abundant number, since it is smaller than the sum of its proper divisors (1952000).

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

1339840 is an equidigital number, since it uses as much as digits as its factorization.

1339840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149 (or 139 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 1339840 is about 1157.5145787419. The cubic root of 1339840 is about 110.2429890150.

The spelling of 1339840 in words is "one million, three hundred thirty-nine thousand, eight hundred forty".