13820249 has 4 divisors (see below), whose sum is σ = 13864164. Its totient is φ = 13776336.

The previous prime is 13820237. The next prime is 13820293. The reversal of 13820249 is 94202831.

13820249 is digitally balanced in base 2, 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.

It can be written as a sum of positive squares in 2 ways, for example, as 366025 + 13454224 = 605^2 + 3668^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13820249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13820299) 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, 21482 + ... + 22115.

It is an arithmetic number, because the mean of its divisors is an integer number (3466041).

Almost surely, 2^13820249 is an apocalyptic number.

It is an amenable number.

13820249 is a deficient number, since it is larger than the sum of its proper divisors (43915).

13820249 is an equidigital number, since it uses as much as digits as its factorization.

13820249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43914.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 13820249 is about 3717.5595489514. The cubic root of 13820249 is about 239.9782908604.

The spelling of 13820249 in words is "thirteen million, eight hundred twenty thousand, two hundred forty-nine".