13878973 has 2 divisors, whose sum is σ = 13878974. Its totient is φ = 13878972.

The previous prime is 13878971. The next prime is 13878989. The reversal of 13878973 is 37987831.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12131289 + 1747684 = 3483^2 + 1322^2 .

It is a cyclic number.

It is not a de Polignac number, because 13878973 - 2¹ = 13878971 is a prime.

Together with 13878971, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13878971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6939486 + 6939487.

It is an arithmetic number, because the mean of its divisors is an integer number (6939487).

Almost surely, 2^13878973 is an apocalyptic number.

It is an amenable number.

13878973 is a deficient number, since it is larger than the sum of its proper divisors (1).

13878973 is an equidigital number, since it uses as much as digits as its factorization.

13878973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 46.

The square root of 13878973 is about 3725.4493688681. The cubic root of 13878973 is about 240.3177100195.

The spelling of 13878973 in words is "thirteen million, eight hundred seventy-eight thousand, nine hundred seventy-three".