129801988 has 6 divisors (see below), whose sum is σ = 227153486. Its totient is φ = 64900992.

The previous prime is 129801967. The next prime is 129801989. The reversal of 129801988 is 889108921.

It can be written as a sum of positive squares in only one way, i.e., 105021504 + 24780484 = 10248^2 + 4978^2 .

It is a super-5 number, since 5×129801988⁵ (a number of 42 digits) contains 55555 as substring.

It is not an unprimeable number, because it can be changed into a prime (129801989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16225245 + ... + 16225252.

Almost surely, 2^129801988 is an apocalyptic number.

It is an amenable number.

129801988 is a deficient number, since it is larger than the sum of its proper divisors (97351498).

129801988 is a wasteful number, since it uses less digits than its factorization.

129801988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32450501 (or 32450499 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 46.

The square root of 129801988 is about 11393.0675412726. The cubic root of 129801988 is about 506.3223690070.

The spelling of 129801988 in words is "one hundred twenty-nine million, eight hundred one thousand, nine hundred eighty-eight".