129321956 has 48 divisors (see below), whose sum is σ = 243919872. Its totient is φ = 59875200.

The previous prime is 129321953. The next prime is 129321967. The reversal of 129321956 is 659123921.

Its product of digits (29160) is a multiple of the sum of its prime factors (540).

It is not an unprimeable number, because it can be changed into a prime (129321953) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 325550 + ... + 325946.

It is an arithmetic number, because the mean of its divisors is an integer number (5081664).

Almost surely, 2^129321956 is an apocalyptic number.

It is an amenable number.

129321956 is a deficient number, since it is larger than the sum of its proper divisors (114597916).

129321956 is a wasteful number, since it uses less digits than its factorization.

129321956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540 (or 538 counting only the distinct ones).

The product of its digits is 29160, while the sum is 38.

The square root of 129321956 is about 11371.9811818346. The cubic root of 129321956 is about 505.6974397687.

The spelling of 129321956 in words is "one hundred twenty-nine million, three hundred twenty-one thousand, nine hundred fifty-six".