129135990 has 16 divisors (see below), whose sum is σ = 309926448. Its totient is φ = 34436256.

The previous prime is 129135983. The next prime is 129135991. The reversal of 129135990 is 99531921.

It is a super-2 number, since 2×129135990² = 33352207826560200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129135991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2152237 + ... + 2152296.

It is an arithmetic number, because the mean of its divisors is an integer number (19370403).

Almost surely, 2^129135990 is an apocalyptic number.

129135990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129135990 is an abundant number, since it is smaller than the sum of its proper divisors (180790458).

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

129135990 is a wasteful number, since it uses less digits than its factorization.

129135990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4304543.

The product of its (nonzero) digits is 21870, while the sum is 39.

The square root of 129135990 is about 11363.8017406148. The cubic root of 129135990 is about 505.4549245068.

The spelling of 129135990 in words is "one hundred twenty-nine million, one hundred thirty-five thousand, nine hundred ninety".