1338686831 has 4 divisors (see below), whose sum is σ = 1354815672. Its totient is φ = 1322557992.

The previous prime is 1338686827. The next prime is 1338686849. The reversal of 1338686831 is 1386868331.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1338686831 - 2² = 1338686827 is a prime.

It is a super-2 number, since 2×1338686831² = 3584164862985645122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1338686851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8064296 + ... + 8064461.

It is an arithmetic number, because the mean of its divisors is an integer number (338703918).

Almost surely, 2^1338686831 is an apocalyptic number.

1338686831 is a deficient number, since it is larger than the sum of its proper divisors (16128841).

1338686831 is an equidigital number, since it uses as much as digits as its factorization.

1338686831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16128840.

The product of its digits is 497664, while the sum is 47.

The square root of 1338686831 is about 36588.0695172620. The cubic root of 1338686831 is about 1102.1135208147.

The spelling of 1338686831 in words is "one billion, three hundred thirty-eight million, six hundred eighty-six thousand, eight hundred thirty-one".