1340240 has 40 divisors (see below), whose sum is σ = 3401568. Its totient is φ = 487040.

The previous prime is 1340237. The next prime is 1340243. The reversal of 1340240 is 420431.

It is an interprime number because it is at equal distance from previous prime (1340237) and next prime (1340243).

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1340243) 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, 119 + ... + 1641.

2^1340240 is an apocalyptic number.

1340240 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 1340240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1700784).

1340240 is an abundant number, since it is smaller than the sum of its proper divisors (2061328).

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

1340240 is a wasteful number, since it uses less digits than its factorization.

1340240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1547 (or 1541 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 1340240 is about 1157.6873498488. The cubic root of 1340240 is about 110.2539586850.

Adding to 1340240 its reverse (420431), we get a palindrome (1760671).

The spelling of 1340240 in words is "one million, three hundred forty thousand, two hundred forty".