129342078 has 24 divisors (see below), whose sum is σ = 280451808. Its totient is φ = 43081632.

The previous prime is 129342077. The next prime is 129342079. The reversal of 129342078 is 870243921.

It is an interprime number because it is at equal distance from previous prime (129342077) and next prime (129342079).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129342077) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41275 + ... + 44297.

It is an arithmetic number, because the mean of its divisors is an integer number (11685492).

Almost surely, 2^129342078 is an apocalyptic number.

129342078 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

129342078 is an abundant number, since it is smaller than the sum of its proper divisors (151109730).

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

129342078 is a wasteful number, since it uses less digits than its factorization.

129342078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5408 (or 5405 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 129342078 is about 11372.8658657350. The cubic root of 129342078 is about 505.7236666021.

Adding to 129342078 its reverse (870243921), we get a palindrome (999585999).

The spelling of 129342078 in words is "one hundred twenty-nine million, three hundred forty-two thousand, seventy-eight".