129768489 has 12 divisors (see below), whose sum is σ = 187544500. Its totient is φ = 86465664.

The previous prime is 129768487. The next prime is 129768491. The reversal of 129768489 is 984867921.

129768489 is a `hidden beast` number, since 12 + 97 + 68 + 489 = 666.

It is an interprime number because it is at equal distance from previous prime (129768487) and next prime (129768491).

It can be written as a sum of positive squares in 2 ways, for example, as 7290000 + 122478489 = 2700^2 + 11067^2 .

It is not a de Polignac number, because 129768489 - 2¹ = 129768487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129768487) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25077 + ... + 29805.

Almost surely, 2^129768489 is an apocalyptic number.

It is an amenable number.

129768489 is a deficient number, since it is larger than the sum of its proper divisors (57776011).

129768489 is a wasteful number, since it uses less digits than its factorization.

129768489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7784 (or 7781 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 54.

The square root of 129768489 is about 11391.5972980087. The cubic root of 129768489 is about 506.2788084201.

The spelling of 129768489 in words is "one hundred twenty-nine million, seven hundred sixty-eight thousand, four hundred eighty-nine".