13919387 has 2 divisors, whose sum is σ = 13919388. Its totient is φ = 13919386.

The previous prime is 13919383. The next prime is 13919417. The reversal of 13919387 is 78391931.

13919387 is digitally balanced in base 2, 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 13919387 - 2² = 13919383 is a prime.

It is not a weakly prime, because it can be changed into another prime (13919383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6959693 + 6959694.

It is an arithmetic number, because the mean of its divisors is an integer number (6959694).

Almost surely, 2^13919387 is an apocalyptic number.

13919387 is a deficient number, since it is larger than the sum of its proper divisors (1).

13919387 is an equidigital number, since it uses as much as digits as its factorization.

13919387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 41.

The square root of 13919387 is about 3730.8694697081. The cubic root of 13919387 is about 240.5507433093.

The spelling of 13919387 in words is "thirteen million, nine hundred nineteen thousand, three hundred eighty-seven".