1340643240 has 96 divisors (see below), whose sum is σ = 4364474400. Its totient is φ = 356899200.

The previous prime is 1340643221. The next prime is 1340643257. The reversal of 1340643240 is 423460431.

1340643240 is a `hidden beast` number, since 13 + 4 + 0 + 643 + 2 + 4 + 0 = 666.

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 23 ways as a sum of consecutive naturals, for example, 234415 + ... + 240065.

It is an arithmetic number, because the mean of its divisors is an integer number (45463275).

Almost surely, 2^1340643240 is an apocalyptic number.

1340643240 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 1340643240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2182237200).

1340643240 is an abundant number, since it is smaller than the sum of its proper divisors (3023831160).

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

1340643240 is a wasteful number, since it uses less digits than its factorization.

1340643240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6327 (or 6320 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

The square root of 1340643240 is about 36614.7953701779. The cubic root of 1340643240 is about 1102.6501500037.

The spelling of 1340643240 in words is "one billion, three hundred forty million, six hundred forty-three thousand, two hundred forty".