129387489 has 80 divisors (see below), whose sum is σ = 232326144. Its totient is φ = 63386400.

The previous prime is 129387481. The next prime is 129387491. The reversal of 129387489 is 984783921.

129387489 = T₁₅₆₇ + T₁₅₆₈ + ... + T₁₆₆₅.

It is not a de Polignac number, because 129387489 - 2³ = 129387481 is a prime.

It is a super-2 number, since 2×129387489² = 33482244619450242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (129387481) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1822324 + ... + 1822394.

Almost surely, 2^129387489 is an apocalyptic number.

It is an amenable number.

129387489 is a deficient number, since it is larger than the sum of its proper divisors (102938655).

129387489 is an equidigital number, since it uses as much as digits as its factorization.

129387489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136 (or 115 counting only the distinct ones).

The product of its digits is 870912, while the sum is 51.

The square root of 129387489 is about 11374.8621530109. The cubic root of 129387489 is about 505.7828448954.

The spelling of 129387489 in words is "one hundred twenty-nine million, three hundred eighty-seven thousand, four hundred eighty-nine".