129142320 has 40 divisors (see below), whose sum is σ = 400341936. Its totient is φ = 34437888.

The previous prime is 129142271. The next prime is 129142331. The reversal of 129142320 is 23241921.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 268807 + ... + 269286.

Almost surely, 2^129142320 is an apocalyptic number.

129142320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129142320 is an abundant number, since it is smaller than the sum of its proper divisors (271199616).

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

129142320 is a wasteful number, since it uses less digits than its factorization.

129142320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538109 (or 538103 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 129142320 is about 11364.0802531485. The cubic root of 129142320 is about 505.4631831841.

The spelling of 129142320 in words is "one hundred twenty-nine million, one hundred forty-two thousand, three hundred twenty".