13929989 has 2 divisors, whose sum is σ = 13929990. Its totient is φ = 13929988.

The previous prime is 13929967. The next prime is 13929997. The reversal of 13929989 is 98992931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9796900 + 4133089 = 3130^2 + 2033^2 .

It is an emirp because it is prime and its reverse (98992931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13929989 - 2¹² = 13925893 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13923989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6964994 + 6964995.

It is an arithmetic number, because the mean of its divisors is an integer number (6964995).

Almost surely, 2^13929989 is an apocalyptic number.

It is an amenable number.

13929989 is a deficient number, since it is larger than the sum of its proper divisors (1).

13929989 is an equidigital number, since it uses as much as digits as its factorization.

13929989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 314928, while the sum is 50.

The square root of 13929989 is about 3732.2900476785. The cubic root of 13929989 is about 240.6118013562.

The spelling of 13929989 in words is "thirteen million, nine hundred twenty-nine thousand, nine hundred eighty-nine".