13505399 has 4 divisors (see below), whose sum is σ = 13561680. Its totient is φ = 13449120.

The previous prime is 13505381. The next prime is 13505411. The reversal of 13505399 is 99350531.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13505399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13505099) 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, 27779 + ... + 28260.

It is an arithmetic number, because the mean of its divisors is an integer number (3390420).

Almost surely, 2^13505399 is an apocalyptic number.

13505399 is a deficient number, since it is larger than the sum of its proper divisors (56281).

13505399 is an equidigital number, since it uses as much as digits as its factorization.

13505399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56280.

The product of its (nonzero) digits is 18225, while the sum is 35.

The square root of 13505399 is about 3674.9692515720. The cubic root of 13505399 is about 238.1418957064.

The spelling of 13505399 in words is "thirteen million, five hundred five thousand, three hundred ninety-nine".