129688493 has 8 divisors (see below), whose sum is σ = 146357280. Its totient is φ = 113832880.

The previous prime is 129688457. The next prime is 129688511. The reversal of 129688493 is 394886921.

It is a happy number.

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 129688493 - 2¹² = 129684397 is a prime.

It is a super-2 number, since 2×129688493² = 33638210433222098, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129688423) 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, 202955 + ... + 203592.

It is an arithmetic number, because the mean of its divisors is an integer number (18294660).

Almost surely, 2^129688493 is an apocalyptic number.

It is an amenable number.

129688493 is a deficient number, since it is larger than the sum of its proper divisors (16668787).

129688493 is a wasteful number, since it uses less digits than its factorization.

129688493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406587.

The product of its digits is 746496, while the sum is 50.

The square root of 129688493 is about 11388.0855722110. The cubic root of 129688493 is about 506.1747548991.

The spelling of 129688493 in words is "one hundred twenty-nine million, six hundred eighty-eight thousand, four hundred ninety-three".