129691842 has 16 divisors (see below), whose sum is σ = 296438592. Its totient is φ = 37054800.

The previous prime is 129691841. The next prime is 129691867. The reversal of 129691842 is 248196921.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 3087901 = 129691842 / (1 + 2 + 9 + 6 + 9 + 1 + 8 + 4 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 129691794 and 129691803.

It is not an unprimeable number, because it can be changed into a prime (129691841) 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, 1543909 + ... + 1543992.

It is an arithmetic number, because the mean of its divisors is an integer number (18527412).

Almost surely, 2^129691842 is an apocalyptic number.

129691842 is an abundant number, since it is smaller than the sum of its proper divisors (166746750).

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

129691842 is a wasteful number, since it uses less digits than its factorization.

129691842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3087913.

The product of its digits is 62208, while the sum is 42.

The square root of 129691842 is about 11388.2326109015. The cubic root of 129691842 is about 506.1791119155.

The spelling of 129691842 in words is "one hundred twenty-nine million, six hundred ninety-one thousand, eight hundred forty-two".