129939552 has 60 divisors (see below), whose sum is σ = 382156236. Its totient is φ = 43312320.

The previous prime is 129939539. The next prime is 129939559. The reversal of 129939552 is 255939921.

129939552 is a `hidden beast` number, since 1 + 2 + 9 + 93 + 9 + 552 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 129939498 and 129939507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129939559) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 22474 + ... + 27657.

Almost surely, 2^129939552 is an apocalyptic number.

129939552 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

129939552 is an abundant number, since it is smaller than the sum of its proper divisors (252216684).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129939552 is an equidigital number, since it uses as much as digits as its factorization.

129939552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50153 (or 50136 counting only the distinct ones).

The product of its digits is 218700, while the sum is 45.

The square root of 129939552 is about 11399.1031226145. The cubic root of 129939552 is about 506.5011724812.

The spelling of 129939552 in words is "one hundred twenty-nine million, nine hundred thirty-nine thousand, five hundred fifty-two".