129517890 has 16 divisors (see below), whose sum is σ = 310843008. Its totient is φ = 34538096.

The previous prime is 129517859. The next prime is 129517891. The reversal of 129517890 is 98715921.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (129517891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2158602 + ... + 2158661.

It is an arithmetic number, because the mean of its divisors is an integer number (19427688).

Almost surely, 2^129517890 is an apocalyptic number.

129517890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129517890 is an abundant number, since it is smaller than the sum of its proper divisors (181325118).

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

129517890 is a wasteful number, since it uses less digits than its factorization.

129517890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4317273.

The product of its (nonzero) digits is 45360, while the sum is 42.

The square root of 129517890 is about 11380.5926910684. The cubic root of 129517890 is about 505.9527027505.

The spelling of 129517890 in words is "one hundred twenty-nine million, five hundred seventeen thousand, eight hundred ninety".