129429994 has 4 divisors (see below), whose sum is σ = 194144994. Its totient is φ = 64714996.

The previous prime is 129429973. The next prime is 129430001. The reversal of 129429994 is 499924921.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 499924921 = 383 ⋅1305287.

It can be written as a sum of positive squares in only one way, i.e., 105781225 + 23648769 = 10285^2 + 4863^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32357497 + ... + 32357500.

Almost surely, 2^129429994 is an apocalyptic number.

129429994 is a deficient number, since it is larger than the sum of its proper divisors (64715000).

129429994 is an equidigital number, since it uses as much as digits as its factorization.

129429994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64714999.

The product of its digits is 419904, while the sum is 49.

The square root of 129429994 is about 11376.7303738816. The cubic root of 129429994 is about 505.8382236297.

The spelling of 129429994 in words is "one hundred twenty-nine million, four hundred twenty-nine thousand, nine hundred ninety-four".