129435770 has 16 divisors (see below), whose sum is σ = 238667688. Its totient is φ = 50511360.

The previous prime is 129435763. The next prime is 129435781. The reversal of 129435770 is 77534921.

It can be written as a sum of positive squares in 4 ways, for example, as 99940009 + 29495761 = 9997^2 + 5431^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157439 + ... + 158258.

Almost surely, 2^129435770 is an apocalyptic number.

129435770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129435770 is a deficient number, since it is larger than the sum of its proper divisors (109231918).

129435770 is a wasteful number, since it uses less digits than its factorization.

129435770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315745.

The product of its (nonzero) digits is 52920, while the sum is 38.

The square root of 129435770 is about 11376.9842225433. The cubic root of 129435770 is about 505.8457481043.

The spelling of 129435770 in words is "one hundred twenty-nine million, four hundred thirty-five thousand, seven hundred seventy".