129247988 has 6 divisors (see below), whose sum is σ = 226183986. Its totient is φ = 64623992.

The previous prime is 129247969. The next prime is 129247999. The reversal of 129247988 is 889742921.

It can be written as a sum of positive squares in only one way, i.e., 67436944 + 61811044 = 8212^2 + 7862^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16155995 + ... + 16156002.

It is an arithmetic number, because the mean of its divisors is an integer number (37697331).

Almost surely, 2^129247988 is an apocalyptic number.

It is an amenable number.

129247988 is a deficient number, since it is larger than the sum of its proper divisors (96935998).

129247988 is a wasteful number, since it uses less digits than its factorization.

129247988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32312001 (or 32311999 counting only the distinct ones).

The product of its digits is 580608, while the sum is 50.

The square root of 129247988 is about 11368.7285128989. The cubic root of 129247988 is about 505.6010071566.

The spelling of 129247988 in words is "one hundred twenty-nine million, two hundred forty-seven thousand, nine hundred eighty-eight".