13916989 has 2 divisors, whose sum is σ = 13916990. Its totient is φ = 13916988.

The previous prime is 13916971. The next prime is 13917023. The reversal of 13916989 is 98961931.

13916989 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 can be written as a sum of positive squares in only one way, i.e., 11764900 + 2152089 = 3430^2 + 1467^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13916989 is a prime.

It is a super-2 number, since 2×13916989² = 387365165652242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13916789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6958494 + 6958495.

It is an arithmetic number, because the mean of its divisors is an integer number (6958495).

Almost surely, 2^13916989 is an apocalyptic number.

It is an amenable number.

13916989 is a deficient number, since it is larger than the sum of its proper divisors (1).

13916989 is an equidigital number, since it uses as much as digits as its factorization.

13916989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 104976, while the sum is 46.

The square root of 13916989 is about 3730.5480830570. The cubic root of 13916989 is about 240.5369286729.

The spelling of 13916989 in words is "thirteen million, nine hundred sixteen thousand, nine hundred eighty-nine".