1340828381 has 8 divisors (see below), whose sum is σ = 1358003640. Its totient is φ = 1323721728.

The previous prime is 1340828351. The next prime is 1340828389. The reversal of 1340828381 is 1838280431.

It can be written as a sum of positive squares in 4 ways, for example, as 377719225 + 963109156 = 19435^2 + 31034^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1340828381 - 2⁶ = 1340828317 is a prime.

It is a super-2 number, since 2×1340828381² = 3595641494590162322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1340828389) 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, 22775 + ... + 56571.

It is an arithmetic number, because the mean of its divisors is an integer number (169750455).

Almost surely, 2^1340828381 is an apocalyptic number.

It is an amenable number.

1340828381 is a deficient number, since it is larger than the sum of its proper divisors (17175259).

1340828381 is an equidigital number, since it uses as much as digits as its factorization.

1340828381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34303.

The product of its (nonzero) digits is 36864, while the sum is 38.

The square root of 1340828381 is about 36617.3235095084. The cubic root of 1340828381 is about 1102.7009058272.

The spelling of 1340828381 in words is "one billion, three hundred forty million, eight hundred twenty-eight thousand, three hundred eighty-one".