129774172 has 48 divisors (see below), whose sum is σ = 256177152. Its totient is φ = 57012480.

The previous prime is 129774079. The next prime is 129774173. The reversal of 129774172 is 271477921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129774173) 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, 213493 + ... + 214099.

It is an arithmetic number, because the mean of its divisors is an integer number (5337024).

Almost surely, 2^129774172 is an apocalyptic number.

It is an amenable number.

129774172 is a deficient number, since it is larger than the sum of its proper divisors (126402980).

129774172 is a wasteful number, since it uses less digits than its factorization.

129774172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778 (or 776 counting only the distinct ones).

The product of its digits is 49392, while the sum is 40.

The square root of 129774172 is about 11391.8467335195. The cubic root of 129774172 is about 506.2861988646.

The spelling of 129774172 in words is "one hundred twenty-nine million, seven hundred seventy-four thousand, one hundred seventy-two".