1338107891 has 4 divisors (see below), whose sum is σ = 1338374712. Its totient is φ = 1337841072.

The previous prime is 1338107887. The next prime is 1338107899. The reversal of 1338107891 is 1987018331.

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 1338107891 - 2² = 1338107887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1338107899) 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, 125741 + ... + 135966.

It is an arithmetic number, because the mean of its divisors is an integer number (334593678).

Almost surely, 2^1338107891 is an apocalyptic number.

1338107891 is a deficient number, since it is larger than the sum of its proper divisors (266821).

1338107891 is an equidigital number, since it uses as much as digits as its factorization.

1338107891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266820.

The product of its (nonzero) digits is 36288, while the sum is 41.

The square root of 1338107891 is about 36580.1570663659. The cubic root of 1338107891 is about 1101.9546214144.

The spelling of 1338107891 in words is "one billion, three hundred thirty-eight million, one hundred seven thousand, eight hundred ninety-one".