13778671 has 2 divisors, whose sum is σ = 13778672. Its totient is φ = 13778670.

The previous prime is 13778659. The next prime is 13778717. The reversal of 13778671 is 17687731.

13778671 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13778671 - 2⁷ = 13778543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13778641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6889335 + 6889336.

It is an arithmetic number, because the mean of its divisors is an integer number (6889336).

Almost surely, 2^13778671 is an apocalyptic number.

13778671 is a deficient number, since it is larger than the sum of its proper divisors (1).

13778671 is an equidigital number, since it uses as much as digits as its factorization.

13778671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 49392, while the sum is 40.

The square root of 13778671 is about 3711.9632271885. The cubic root of 13778671 is about 239.7373921576.

The spelling of 13778671 in words is "thirteen million, seven hundred seventy-eight thousand, six hundred seventy-one".