129999994 has 8 divisors (see below), whose sum is σ = 196535808. Its totient is φ = 64488060.

The previous prime is 129999983. The next prime is 129999997. The reversal of 129999994 is 499999921.

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

It is not an unprimeable number, because it can be changed into a prime (129999997) 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, 255652 + ... + 256159.

It is an arithmetic number, because the mean of its divisors is an integer number (24566976).

Almost surely, 2^129999994 is an apocalyptic number.

129999994 is a deficient number, since it is larger than the sum of its proper divisors (66535814).

129999994 is a wasteful number, since it uses less digits than its factorization.

129999994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511940.

The product of its digits is 4251528, while the sum is 61.

The square root of 129999994 is about 11401.7539878740. The cubic root of 129999994 is about 506.5796941166.

The spelling of 129999994 in words is "one hundred twenty-nine million, nine hundred ninety-nine thousand, nine hundred ninety-four".