129117890 has 48 divisors (see below), whose sum is σ = 270531576. Its totient is φ = 44183040.

The previous prime is 129117853. The next prime is 129117913. The reversal of 129117890 is 98711921.

It can be written as a sum of positive squares in 4 ways, for example, as 129117769 + 121 = 11363^2 + 11^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17432 + ... + 23708.

Almost surely, 2^129117890 is an apocalyptic number.

129117890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129117890 is an abundant number, since it is smaller than the sum of its proper divisors (141413686).

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

129117890 is a wasteful number, since it uses less digits than its factorization.

129117890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6323 (or 6312 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 38.

The square root of 129117890 is about 11363.0053242969. The cubic root of 129117890 is about 505.4313081584.

The spelling of 129117890 in words is "one hundred twenty-nine million, one hundred seventeen thousand, eight hundred ninety".