13409789 has 2 divisors, whose sum is σ = 13409790. Its totient is φ = 13409788.

The previous prime is 13409783. The next prime is 13409791. The reversal of 13409789 is 98790431.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11957764 + 1452025 = 3458^2 + 1205^2 .

It is an emirp because it is prime and its reverse (98790431) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13409789 - 2⁸ = 13409533 is a prime.

It is a super-4 number, since 4×13409789⁴ (a number of 30 digits) contains 4444 as substring.

It is a Sophie Germain prime.

Together with 13409791, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13409783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6704894 + 6704895.

It is an arithmetic number, because the mean of its divisors is an integer number (6704895).

Almost surely, 2^13409789 is an apocalyptic number.

It is an amenable number.

13409789 is a deficient number, since it is larger than the sum of its proper divisors (1).

13409789 is an equidigital number, since it uses as much as digits as its factorization.

13409789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 13409789 is about 3661.9378749509. The cubic root of 13409789 is about 237.5785978088.

The spelling of 13409789 in words is "thirteen million, four hundred nine thousand, seven hundred eighty-nine".