129671748 has 18 divisors (see below), whose sum is σ = 327781454. Its totient is φ = 43223904.

The previous prime is 129671693. The next prime is 129671797. The reversal of 129671748 is 847176921.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 80138304 + 49533444 = 8952^2 + 7038^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1800961 + ... + 1801032.

Almost surely, 2^129671748 is an apocalyptic number.

129671748 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

129671748 is an abundant number, since it is smaller than the sum of its proper divisors (198109706).

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

129671748 is a wasteful number, since it uses less digits than its factorization.

129671748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3602003 (or 3601998 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 129671748 is about 11387.3503502790. The cubic root of 129671748 is about 506.1529686920.

The spelling of 129671748 in words is "one hundred twenty-nine million, six hundred seventy-one thousand, seven hundred forty-eight".