129281830 has 8 divisors (see below), whose sum is σ = 232707312. Its totient is φ = 51712728.

The previous prime is 129281813. The next prime is 129281839. The reversal of 129281830 is 38182921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129281839) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6464082 + ... + 6464101.

It is an arithmetic number, because the mean of its divisors is an integer number (29088414).

Almost surely, 2^129281830 is an apocalyptic number.

129281830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129281830 is a deficient number, since it is larger than the sum of its proper divisors (103425482).

129281830 is a wasteful number, since it uses less digits than its factorization.

129281830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12928190.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 129281830 is about 11370.2167965259. The cubic root of 129281830 is about 505.6451317793.

The spelling of 129281830 in words is "one hundred twenty-nine million, two hundred eighty-one thousand, eight hundred thirty".