13991827 has 2 divisors, whose sum is σ = 13991828. Its totient is φ = 13991826.

The previous prime is 13991821. The next prime is 13991839. The reversal of 13991827 is 72819931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13991827 - 2⁷ = 13991699 is a prime.

It is a zygodrome in base 7.

It is a self number, because there is not a number n which added to its sum of digits gives 13991827.

It is not a weakly prime, because it can be changed into another prime (13991821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6995913 + 6995914.

It is an arithmetic number, because the mean of its divisors is an integer number (6995914).

Almost surely, 2^13991827 is an apocalyptic number.

13991827 is a deficient number, since it is larger than the sum of its proper divisors (1).

13991827 is an equidigital number, since it uses as much as digits as its factorization.

13991827 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 40.

The square root of 13991827 is about 3740.5650642650. The cubic root of 13991827 is about 240.9673170672.

The spelling of 13991827 in words is "thirteen million, nine hundred ninety-one thousand, eight hundred twenty-seven".