129627389 has 2 divisors, whose sum is σ = 129627390. Its totient is φ = 129627388.

The previous prime is 129627371. The next prime is 129627401. The reversal of 129627389 is 983726921.

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., 87572164 + 42055225 = 9358^2 + 6485^2 .

It is a cyclic number.

It is not a de Polignac number, because 129627389 - 2⁸ = 129627133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129627319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64813694 + 64813695.

It is an arithmetic number, because the mean of its divisors is an integer number (64813695).

Almost surely, 2^129627389 is an apocalyptic number.

It is an amenable number.

129627389 is a deficient number, since it is larger than the sum of its proper divisors (1).

129627389 is an equidigital number, since it uses as much as digits as its factorization.

129627389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 47.

The square root of 129627389 is about 11385.4024522632. The cubic root of 129627389 is about 506.0952460177.

The spelling of 129627389 in words is "one hundred twenty-nine million, six hundred twenty-seven thousand, three hundred eighty-nine".