129435390 has 48 divisors (see below), whose sum is σ = 384609888. Its totient is φ = 29585088.

The previous prime is 129435379. The next prime is 129435403. The reversal of 129435390 is 93534921.

It is a happy number.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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, 102097 + ... + 103356.

It is an arithmetic number, because the mean of its divisors is an integer number (8012706).

Almost surely, 2^129435390 is an apocalyptic number.

129435390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129435390 is an abundant number, since it is smaller than the sum of its proper divisors (255174498).

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

129435390 is a wasteful number, since it uses less digits than its factorization.

129435390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205473 (or 205470 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 36.

The square root of 129435390 is about 11376.9675221475. The cubic root of 129435390 is about 505.8452530800.

The spelling of 129435390 in words is "one hundred twenty-nine million, four hundred thirty-five thousand, three hundred ninety".