129235690 has 32 divisors (see below), whose sum is σ = 239210496. Its totient is φ = 50240640.

The previous prime is 129235669. The next prime is 129235693. The reversal of 129235690 is 96532921.

It is a super-2 number, since 2×129235690² = 33403727139552200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (129235693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 156619 + ... + 157441.

It is an arithmetic number, because the mean of its divisors is an integer number (7475328).

Almost surely, 2^129235690 is an apocalyptic number.

129235690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129235690 is a deficient number, since it is larger than the sum of its proper divisors (109974806).

129235690 is a wasteful number, since it uses less digits than its factorization.

129235690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1254.

The product of its (nonzero) digits is 29160, while the sum is 37.

The square root of 129235690 is about 11368.1876304009. The cubic root of 129235690 is about 505.5849705990.

The spelling of 129235690 in words is "one hundred twenty-nine million, two hundred thirty-five thousand, six hundred ninety".