129969942 has 8 divisors (see below), whose sum is σ = 259939896. Its totient is φ = 43323312.

The previous prime is 129969923. The next prime is 129969943. The reversal of 129969942 is 249969921.

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

129969942 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129969943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10830823 + ... + 10830834.

It is an arithmetic number, because the mean of its divisors is an integer number (32492487).

Almost surely, 2^129969942 is an apocalyptic number.

129969942 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

129969942 is a wasteful number, since it uses less digits than its factorization.

129969942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21661662.

The product of its digits is 629856, while the sum is 51.

The square root of 129969942 is about 11400.4360442923. The cubic root of 129969942 is about 506.5406558937.

The spelling of 129969942 in words is "one hundred twenty-nine million, nine hundred sixty-nine thousand, nine hundred forty-two".