129240869 has 8 divisors (see below), whose sum is σ = 136160640. Its totient is φ = 122332896.

The previous prime is 129240863. The next prime is 129240899. The reversal of 129240869 is 968042921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 129240869 - 2¹² = 129236773 is a prime.

It is a super-2 number, since 2×129240869² = 33406404439750322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129240863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27929 + ... + 32225.

It is an arithmetic number, because the mean of its divisors is an integer number (17020080).

Almost surely, 2^129240869 is an apocalyptic number.

129240869 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

129240869 is a deficient number, since it is larger than the sum of its proper divisors (6919771).

129240869 is a wasteful number, since it uses less digits than its factorization.

129240869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5899.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 129240869 is about 11368.4154128885. The cubic root of 129240869 is about 505.5917241246.

The spelling of 129240869 in words is "one hundred twenty-nine million, two hundred forty thousand, eight hundred sixty-nine".