13539819 has 4 divisors (see below), whose sum is σ = 18053096. Its totient is φ = 9026544.

The previous prime is 13539811. The next prime is 13539853. The reversal of 13539819 is 91893531.

13539819 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91893531 = 3 ⋅30631177.

It is not a de Polignac number, because 13539819 - 2³ = 13539811 is a prime.

It is a super-2 number, since 2×13539819² = 366653397105522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13539811) 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, 2256634 + ... + 2256639.

It is an arithmetic number, because the mean of its divisors is an integer number (4513274).

Almost surely, 2^13539819 is an apocalyptic number.

13539819 is a deficient number, since it is larger than the sum of its proper divisors (4513277).

13539819 is an equidigital number, since it uses as much as digits as its factorization.

13539819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4513276.

The product of its digits is 29160, while the sum is 39.

The square root of 13539819 is about 3679.6493039419. The cubic root of 13539819 is about 238.3440343813.

The spelling of 13539819 in words is "thirteen million, five hundred thirty-nine thousand, eight hundred nineteen".