129669489 has 24 divisors (see below), whose sum is σ = 200727072. Its totient is φ = 80373120.

The previous prime is 129669473. The next prime is 129669521. The reversal of 129669489 is 984966921.

129669489 is a `hidden beast` number, since 12 + 96 + 69 + 489 = 666.

It is not a de Polignac number, because 129669489 - 2⁴ = 129669473 is a prime.

It is a super-2 number, since 2×129669489² = 33628352755042242, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (129669409) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7594 + ... + 17804.

It is an arithmetic number, because the mean of its divisors is an integer number (8363628).

Almost surely, 2^129669489 is an apocalyptic number.

It is an amenable number.

129669489 is a deficient number, since it is larger than the sum of its proper divisors (71057583).

129669489 is a wasteful number, since it uses less digits than its factorization.

129669489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10317 (or 10314 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 54.

The square root of 129669489 is about 11387.2511608377. The cubic root of 129669489 is about 506.1500294597.

The spelling of 129669489 in words is "one hundred twenty-nine million, six hundred sixty-nine thousand, four hundred eighty-nine".