129879506 has 8 divisors (see below), whose sum is σ = 196060620. Its totient is φ = 64525968.

The previous prime is 129879499. The next prime is 129879511. The reversal of 129879506 is 605978921.

It can be written as a sum of positive squares in 2 ways, for example, as 127803025 + 2076481 = 11305^2 + 1441^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206501 + ... + 207128.

Almost surely, 2^129879506 is an apocalyptic number.

129879506 is a deficient number, since it is larger than the sum of its proper divisors (66181114).

129879506 is a wasteful number, since it uses less digits than its factorization.

129879506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413788.

The product of its (nonzero) digits is 272160, while the sum is 47.

The square root of 129879506 is about 11396.4690145676. The cubic root of 129879506 is about 506.4231411841.

The spelling of 129879506 in words is "one hundred twenty-nine million, eight hundred seventy-nine thousand, five hundred six".