129642270 has 32 divisors (see below), whose sum is σ = 314057088. Its totient is φ = 34247328.

The previous prime is 129642269. The next prime is 129642277. The reversal of 129642270 is 72246921.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129642277) 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 15 ways as a sum of consecutive naturals, for example, 16984 + ... + 23403.

It is an arithmetic number, because the mean of its divisors is an integer number (9814284).

Almost surely, 2^129642270 is an apocalyptic number.

129642270 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129642270 is an abundant number, since it is smaller than the sum of its proper divisors (184414818).

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

129642270 is a wasteful number, since it uses less digits than its factorization.

129642270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40504.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 129642270 is about 11386.0559457610. The cubic root of 129642270 is about 506.1146115629.

The spelling of 129642270 in words is "one hundred twenty-nine million, six hundred forty-two thousand, two hundred seventy".