1338445913 has 4 divisors (see below), whose sum is σ = 1529652480. Its totient is φ = 1147239348.

The previous prime is 1338445897. The next prime is 1338445973. The reversal of 1338445913 is 3195448331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3195448331 = 293 ⋅10905967.

It is a cyclic number.

It is not a de Polignac number, because 1338445913 - 2⁴ = 1338445897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1338445973) 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, 95603273 + ... + 95603286.

It is an arithmetic number, because the mean of its divisors is an integer number (382413120).

Almost surely, 2^1338445913 is an apocalyptic number.

It is an amenable number.

1338445913 is a deficient number, since it is larger than the sum of its proper divisors (191206567).

1338445913 is an equidigital number, since it uses as much as digits as its factorization.

1338445913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191206566.

The product of its digits is 155520, while the sum is 41.

The square root of 1338445913 is about 36584.7770664248. Note that the first 3 decimals coincide. The cubic root of 1338445913 is about 1102.0474025589.

The spelling of 1338445913 in words is "one billion, three hundred thirty-eight million, four hundred forty-five thousand, nine hundred thirteen".