1338205686 has 16 divisors (see below), whose sum is σ = 2685872064. Its totient is φ = 444491784.

The previous prime is 1338205669. The next prime is 1338205699. The reversal of 1338205686 is 6865028331.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 392356 + ... + 395751.

It is an arithmetic number, because the mean of its divisors is an integer number (167867004).

Almost surely, 2^1338205686 is an apocalyptic number.

1338205686 is an abundant number, since it is smaller than the sum of its proper divisors (1347666378).

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

1338205686 is a wasteful number, since it uses less digits than its factorization.

1338205686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 788395.

The product of its (nonzero) digits is 207360, while the sum is 42.

The square root of 1338205686 is about 36581.4937639239. The cubic root of 1338205686 is about 1101.9814660427.

The spelling of 1338205686 in words is "one billion, three hundred thirty-eight million, two hundred five thousand, six hundred eighty-six".