129691879 has 8 divisors (see below), whose sum is σ = 134021120. Its totient is φ = 125371800.

The previous prime is 129691867. The next prime is 129691883. The reversal of 129691879 is 978196921.

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 129691879 - 2¹⁵ = 129659111 is a prime.

It is a super-3 number, since 3×129691879³ (a number of 25 digits) contains 333 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 (129691819) 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, 38014 + ... + 41284.

It is an arithmetic number, because the mean of its divisors is an integer number (16752640).

Almost surely, 2^129691879 is an apocalyptic number.

129691879 is a deficient number, since it is larger than the sum of its proper divisors (4329241).

129691879 is a wasteful number, since it uses less digits than its factorization.

129691879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4581.

The product of its digits is 489888, while the sum is 52.

The square root of 129691879 is about 11388.2342353852. The cubic root of 129691879 is about 506.1791600517.

The spelling of 129691879 in words is "one hundred twenty-nine million, six hundred ninety-one thousand, eight hundred seventy-nine".