129155842 has 8 divisors (see below), whose sum is σ = 193794300. Its totient is φ = 64557744.

The previous prime is 129155797. The next prime is 129155891. The reversal of 129155842 is 248551921.

It can be written as a sum of positive squares in 2 ways, for example, as 129072321 + 83521 = 11361^2 + 289^2 .

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, 117 + ... + 16072.

Almost surely, 2^129155842 is an apocalyptic number.

129155842 is a deficient number, since it is larger than the sum of its proper divisors (64638458).

129155842 is a wasteful number, since it uses less digits than its factorization.

129155842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20180.

The product of its digits is 28800, while the sum is 37.

The square root of 129155842 is about 11364.6751823358. The cubic root of 129155842 is about 505.4808242760.

The spelling of 129155842 in words is "one hundred twenty-nine million, one hundred fifty-five thousand, eight hundred forty-two".