1338905 has 4 divisors (see below), whose sum is σ = 1606692. Its totient is φ = 1071120.

The previous prime is 1338881. The next prime is 1338907. The reversal of 1338905 is 5098331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5098331 = 7 ⋅728333.

It can be written as a sum of positive squares in 2 ways, for example, as 499849 + 839056 = 707^2 + 916^2 .

It is not a de Polignac number, because 1338905 - 2¹⁴ = 1322521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1338907) 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, 133886 + ... + 133895.

It is an arithmetic number, because the mean of its divisors is an integer number (401673).

2^1338905 is an apocalyptic number.

It is an amenable number.

1338905 is a deficient number, since it is larger than the sum of its proper divisors (267787).

1338905 is an equidigital number, since it uses as much as digits as its factorization.

1338905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267786.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 1338905 is about 1157.1106256534. The cubic root of 1338905 is about 110.2173388923.

The spelling of 1338905 in words is "one million, three hundred thirty-eight thousand, nine hundred five".