129401996 has 6 divisors (see below), whose sum is σ = 226453500. Its totient is φ = 64700996.

The previous prime is 129401983. The next prime is 129401999. The reversal of 129401996 is 699104921.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (129401999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16175246 + ... + 16175253.

It is an arithmetic number, because the mean of its divisors is an integer number (37742250).

Almost surely, 2^129401996 is an apocalyptic number.

It is an amenable number.

129401996 is a deficient number, since it is larger than the sum of its proper divisors (97051504).

129401996 is a wasteful number, since it uses less digits than its factorization.

129401996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32350503 (or 32350501 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 129401996 is about 11375.4998131950. The cubic root of 129401996 is about 505.8017470772.

The spelling of 129401996 in words is "one hundred twenty-nine million, four hundred one thousand, nine hundred ninety-six".