129688458 has 16 divisors (see below), whose sum is σ = 263030976. Its totient is φ = 42620480.

The previous prime is 129688457. The next prime is 129688511. The reversal of 129688458 is 854886921.

It is a super-2 number, since 2×129688458² = 33638192276835528, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 129688458.

It is not an unprimeable number, because it can be changed into a prime (129688451) 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, 151791 + ... + 152642.

It is an arithmetic number, because the mean of its divisors is an integer number (16439436).

Almost surely, 2^129688458 is an apocalyptic number.

129688458 is an abundant number, since it is smaller than the sum of its proper divisors (133342518).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129688458 is a wasteful number, since it uses less digits than its factorization.

129688458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304509.

The product of its digits is 1105920, while the sum is 51.

The square root of 129688458 is about 11388.0840355171. The cubic root of 129688458 is about 506.1747093641.

The spelling of 129688458 in words is "one hundred twenty-nine million, six hundred eighty-eight thousand, four hundred fifty-eight".