129397924 has 6 divisors (see below), whose sum is σ = 226446374. Its totient is φ = 64698960.

The previous prime is 129397921. The next prime is 129397943. The reversal of 129397924 is 429793921.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 69056100 + 60341824 = 8310^2 + 7768^2 .

It is not an unprimeable number, because it can be changed into a prime (129397921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16174737 + ... + 16174744.

Almost surely, 2^129397924 is an apocalyptic number.

It is an amenable number.

129397924 is a deficient number, since it is larger than the sum of its proper divisors (97048450).

129397924 is a wasteful number, since it uses less digits than its factorization.

129397924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32349485 (or 32349483 counting only the distinct ones).

The product of its digits is 244944, while the sum is 46.

The square root of 129397924 is about 11375.3208306403. The cubic root of 129397924 is about 505.7964415271.

It can be divided in two parts, 129397 and 924, that added together give a 4-th power (130321 = 19⁴).

The spelling of 129397924 in words is "one hundred twenty-nine million, three hundred ninety-seven thousand, nine hundred twenty-four".