129638372 has 6 divisors (see below), whose sum is σ = 226867158. Its totient is φ = 64819184.

The previous prime is 129638357. The next prime is 129638389. The reversal of 129638372 is 273836921.

It can be written as a sum of positive squares in only one way, i.e., 87310336 + 42328036 = 9344^2 + 6506^2 .

It is a super-2 number, since 2×129638372² = 33612214989620768, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16204793 + ... + 16204800.

It is an arithmetic number, because the mean of its divisors is an integer number (37811193).

Almost surely, 2^129638372 is an apocalyptic number.

It is an amenable number.

129638372 is a deficient number, since it is larger than the sum of its proper divisors (97228786).

129638372 is a wasteful number, since it uses less digits than its factorization.

129638372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32409597 (or 32409595 counting only the distinct ones).

The product of its digits is 108864, while the sum is 41.

The square root of 129638372 is about 11385.8847701880. The cubic root of 129638372 is about 506.1095390030.

The spelling of 129638372 in words is "one hundred twenty-nine million, six hundred thirty-eight thousand, three hundred seventy-two".