1340839947 has 8 divisors (see below), whose sum is σ = 1865516544. Its totient is φ = 855028328.

The previous prime is 1340839939. The next prime is 1340839949. The reversal of 1340839947 is 7499380431.

It is a happy number.

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 1340839947 - 2³ = 1340839939 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1340839896 and 1340839905.

It is not an unprimeable number, because it can be changed into a prime (1340839949) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 9716163 + ... + 9716300.

It is an arithmetic number, because the mean of its divisors is an integer number (233189568).

Almost surely, 2^1340839947 is an apocalyptic number.

1340839947 is a deficient number, since it is larger than the sum of its proper divisors (524676597).

1340839947 is a wasteful number, since it uses less digits than its factorization.

1340839947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19432489.

The product of its (nonzero) digits is 653184, while the sum is 48.

The square root of 1340839947 is about 36617.4814398806. The cubic root of 1340839947 is about 1102.7040764547.

The spelling of 1340839947 in words is "one billion, three hundred forty million, eight hundred thirty-nine thousand, nine hundred forty-seven".