1391338705 has 8 divisors (see below), whose sum is σ = 1670783400. Its totient is φ = 1112286336.

The previous prime is 1391338699. The next prime is 1391338723. The reversal of 1391338705 is 5078331931.

It can be written as a sum of positive squares in 4 ways, for example, as 28547649 + 1362791056 = 5343^2 + 36916^2 .

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 1391338705 - 2⁵ = 1391338673 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90220 + ... + 104509.

It is an arithmetic number, because the mean of its divisors is an integer number (208847925).

Almost surely, 2^1391338705 is an apocalyptic number.

It is an amenable number.

1391338705 is a deficient number, since it is larger than the sum of its proper divisors (279444695).

1391338705 is a wasteful number, since it uses less digits than its factorization.

1391338705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196163.

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 1391338705 is about 37300.6528763238. The cubic root of 1391338705 is about 1116.3771932022.

The spelling of 1391338705 in words is "one billion, three hundred ninety-one million, three hundred thirty-eight thousand, seven hundred five".