13331405 has 4 divisors (see below), whose sum is σ = 15997692. Its totient is φ = 10665120.

The previous prime is 13331309. The next prime is 13331411. The reversal of 13331405 is 50413331.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50413331 = 2393 ⋅21067.

It can be written as a sum of positive squares in 2 ways, for example, as 6461764 + 6869641 = 2542^2 + 2621^2 .

It is not a de Polignac number, because 13331405 - 2¹⁴ = 13315021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1333136 + ... + 1333145.

It is an arithmetic number, because the mean of its divisors is an integer number (3999423).

Almost surely, 2^13331405 is an apocalyptic number.

It is an amenable number.

13331405 is a deficient number, since it is larger than the sum of its proper divisors (2666287).

13331405 is an equidigital number, since it uses as much as digits as its factorization.

13331405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2666286.

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 13331405 is about 3651.2196592372. The cubic root of 13331405 is about 237.1147882883.

Adding to 13331405 its reverse (50413331), we get a palindrome (63744736).

The spelling of 13331405 in words is "thirteen million, three hundred thirty-one thousand, four hundred five".