1340340 has 48 divisors (see below), whose sum is σ = 3810240. Its totient is φ = 352000.

The previous prime is 1340333. The next prime is 1340357. The reversal of 1340340 is 430431.

1340340 = 76² + 77² + ... + 164².

It is a super-2 number, since 2×1340340² = 3593022631200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5215 + ... + 5465.

It is an arithmetic number, because the mean of its divisors is an integer number (79380).

2^1340340 is an apocalyptic number.

1340340 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 1340340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1905120).

1340340 is an abundant number, since it is smaller than the sum of its proper divisors (2469900).

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

1340340 is a wasteful number, since it uses less digits than its factorization.

1340340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352 (or 350 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 1340340 is about 1157.7305385970. The cubic root of 1340340 is about 110.2567007615.

Adding to 1340340 its reverse (430431), we get a palindrome (1770771).

Subtracting from 1340340 its reverse (430431), we obtain a palindrome (909909).

The spelling of 1340340 in words is "one million, three hundred forty thousand, three hundred forty".