13878017 has 2 divisors, whose sum is σ = 13878018. Its totient is φ = 13878016.

The previous prime is 13877971. The next prime is 13878023. The reversal of 13878017 is 71087831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12138256 + 1739761 = 3484^2 + 1319^2 .

It is a cyclic number.

It is not a de Polignac number, because 13878017 - 2¹⁴ = 13861633 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13878047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6939008 + 6939009.

It is an arithmetic number, because the mean of its divisors is an integer number (6939009).

Almost surely, 2^13878017 is an apocalyptic number.

It is an amenable number.

13878017 is a deficient number, since it is larger than the sum of its proper divisors (1).

13878017 is an equidigital number, since it uses as much as digits as its factorization.

13878017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9408, while the sum is 35.

The square root of 13878017 is about 3725.3210599893. The cubic root of 13878017 is about 240.3121921039.

The spelling of 13878017 in words is "thirteen million, eight hundred seventy-eight thousand, seventeen".