129320446 has 8 divisors (see below), whose sum is σ = 194113584. Its totient is φ = 64615920.

The previous prime is 129320407. The next prime is 129320447. The reversal of 129320446 is 644023921.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129320447) 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, 18375 + ... + 24418.

It is an arithmetic number, because the mean of its divisors is an integer number (24264198).

Almost surely, 2^129320446 is an apocalyptic number.

129320446 is a deficient number, since it is larger than the sum of its proper divisors (64793138).

129320446 is a wasteful number, since it uses less digits than its factorization.

129320446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44306.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 129320446 is about 11371.9147903948. The cubic root of 129320446 is about 505.6954715386.

The spelling of 129320446 in words is "one hundred twenty-nine million, three hundred twenty thousand, four hundred forty-six".