13878917 has 8 divisors (see below), whose sum is σ = 15429120. Its totient is φ = 12397680.

The previous prime is 13878883. The next prime is 13878923. The reversal of 13878917 is 71987831.

13878917 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13878917 - 2¹⁰ = 13877893 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 (13878937) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16817 + ... + 17622.

It is an arithmetic number, because the mean of its divisors is an integer number (1928640).

Almost surely, 2^13878917 is an apocalyptic number.

It is an amenable number.

13878917 is a deficient number, since it is larger than the sum of its proper divisors (1550203).

13878917 is a wasteful number, since it uses less digits than its factorization.

13878917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34483.

The product of its digits is 84672, while the sum is 44.

The square root of 13878917 is about 3725.4418529887. The cubic root of 13878917 is about 240.3173868014.

The spelling of 13878917 in words is "thirteen million, eight hundred seventy-eight thousand, nine hundred seventeen".