13409399 has 4 divisors (see below), whose sum is σ = 13445160. Its totient is φ = 13373640.

The previous prime is 13409369. The next prime is 13409401. The reversal of 13409399 is 99390431.

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-13409399 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 (13409309) 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, 17312 + ... + 18069.

It is an arithmetic number, because the mean of its divisors is an integer number (3361290).

Almost surely, 2^13409399 is an apocalyptic number.

13409399 is a deficient number, since it is larger than the sum of its proper divisors (35761).

13409399 is an equidigital number, since it uses as much as digits as its factorization.

13409399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35760.

The product of its (nonzero) digits is 26244, while the sum is 38.

The square root of 13409399 is about 3661.8846240700. The cubic root of 13409399 is about 237.5762946020.

The spelling of 13409399 in words is "thirteen million, four hundred nine thousand, three hundred ninety-nine".