1340438400 has 576 divisors, whose sum is σ = 5606858400. Its totient is φ = 298598400.

The previous prime is 1340438387. The next prime is 1340438417. The reversal of 1340438400 is 48340431.

It is a tau number, because it is divible by the number of its divisors (576).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 12297546 + ... + 12297654.

Almost surely, 2^1340438400 is an apocalyptic number.

1340438400 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 1340438400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2803429200).

1340438400 is an abundant number, since it is smaller than the sum of its proper divisors (4266420000).

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

1340438400 is a wasteful number, since it uses less digits than its factorization.

1340438400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207 (or 187 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 1340438400 is about 36611.9980334316. The cubic root of 1340438400 is about 1102.5939883159.

Adding to 1340438400 its reverse (48340431), we get a palindrome (1388778831).

The spelling of 1340438400 in words is "one billion, three hundred forty million, four hundred thirty-eight thousand, four hundred".