13878569 has 4 divisors (see below), whose sum is σ = 14609040. Its totient is φ = 13148100.

The previous prime is 13878563. The next prime is 13878619. The reversal of 13878569 is 96587831.

It is a happy number.

13878569 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, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 96587831 = 5807 ⋅16633.

It is a cyclic number.

It is not a de Polignac number, because 13878569 - 2¹² = 13874473 is a prime.

It is a super-2 number, since 2×13878569² = 385229354975522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13878563) 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, 365207 + ... + 365244.

It is an arithmetic number, because the mean of its divisors is an integer number (3652260).

Almost surely, 2^13878569 is an apocalyptic number.

13878569 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

13878569 is a deficient number, since it is larger than the sum of its proper divisors (730471).

13878569 is an equidigital number, since it uses as much as digits as its factorization.

13878569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 730470.

The product of its digits is 362880, while the sum is 47.

The square root of 13878569 is about 3725.3951468267. The cubic root of 13878569 is about 240.3153782116.

The spelling of 13878569 in words is "thirteen million, eight hundred seventy-eight thousand, five hundred sixty-nine".