1340839905 has 16 divisors (see below), whose sum is σ = 2154969600. Its totient is φ = 711906048.

The previous prime is 1340839883. The next prime is 1340839919. The reversal of 1340839905 is 5099380431.

It is not a de Polignac number, because 1340839905 - 2⁹ = 1340839393 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 197080 + ... + 203769.

It is an arithmetic number, because the mean of its divisors is an integer number (134685600).

Almost surely, 2^1340839905 is an apocalyptic number.

1340839905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1340839905 is a deficient number, since it is larger than the sum of its proper divisors (814129695).

1340839905 is a wasteful number, since it uses less digits than its factorization.

1340839905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401080.

The product of its (nonzero) digits is 116640, while the sum is 42.

The square root of 1340839905 is about 36617.4808663840. The cubic root of 1340839905 is about 1102.7040649411.

The spelling of 1340839905 in words is "one billion, three hundred forty million, eight hundred thirty-nine thousand, nine hundred five".