129835890 has 24 divisors (see below), whose sum is σ = 337573548. Its totient is φ = 34622880.

The previous prime is 129835861. The next prime is 129835903. The reversal of 129835890 is 98538921.

It is a happy number.

129835890 is a `hidden beast` number, since 1 + 298 + 358 + 9 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 125686521 + 4149369 = 11211^2 + 2037^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 721221 + ... + 721400.

Almost surely, 2^129835890 is an apocalyptic number.

129835890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129835890 is an abundant number, since it is smaller than the sum of its proper divisors (207737658).

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

129835890 is a wasteful number, since it uses less digits than its factorization.

129835890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1442634 (or 1442631 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The square root of 129835890 is about 11394.5552787285. Note that the first 3 decimals coincide. The cubic root of 129835890 is about 506.3664460072.

The spelling of 129835890 in words is "one hundred twenty-nine million, eight hundred thirty-five thousand, eight hundred ninety".