129249342 has 24 divisors (see below), whose sum is σ = 286000416. Its totient is φ = 42166176.

The previous prime is 129249331. The next prime is 129249359. The reversal of 129249342 is 243942921.

129249342 is a `hidden beast` number, since 129 + 2 + 493 + 42 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 129249297 and 129249306.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 75543 + ... + 77234.

It is an arithmetic number, because the mean of its divisors is an integer number (11916684).

Almost surely, 2^129249342 is an apocalyptic number.

129249342 is an abundant number, since it is smaller than the sum of its proper divisors (156751074).

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

129249342 is a wasteful number, since it uses less digits than its factorization.

129249342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152832 (or 152829 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 129249342 is about 11368.7880620583. The cubic root of 129249342 is about 505.6027727067.

The spelling of 129249342 in words is "one hundred twenty-nine million, two hundred forty-nine thousand, three hundred forty-two".