129746389 has 2 divisors, whose sum is σ = 129746390. Its totient is φ = 129746388.

The previous prime is 129746387. The next prime is 129746429. The reversal of 129746389 is 983647921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129618225 + 128164 = 11385^2 + 358^2 .

It is an emirp because it is prime and its reverse (983647921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129746389 - 2¹ = 129746387 is a prime.

Together with 129746387, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129746387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64873194 + 64873195.

It is an arithmetic number, because the mean of its divisors is an integer number (64873195).

Almost surely, 2^129746389 is an apocalyptic number.

It is an amenable number.

129746389 is a deficient number, since it is larger than the sum of its proper divisors (1).

129746389 is an equidigital number, since it uses as much as digits as its factorization.

129746389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 49.

The square root of 129746389 is about 11390.6272434840. The cubic root of 129746389 is about 506.2500664736.

The spelling of 129746389 in words is "one hundred twenty-nine million, seven hundred forty-six thousand, three hundred eighty-nine".