129012830 has 16 divisors (see below), whose sum is σ = 245883600. Its totient is φ = 48569472.

The previous prime is 129012817. The next prime is 129012833. The reversal of 129012830 is 38210921.

It is a self number, because there is not a number n which added to its sum of digits gives 129012830.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129012833) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 379280 + ... + 379619.

It is an arithmetic number, because the mean of its divisors is an integer number (15367725).

Almost surely, 2^129012830 is an apocalyptic number.

129012830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129012830 is a deficient number, since it is larger than the sum of its proper divisors (116870770).

129012830 is a wasteful number, since it uses less digits than its factorization.

129012830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 758923.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 129012830 is about 11358.3814868140. The cubic root of 129012830 is about 505.2941853528.

The spelling of 129012830 in words is "one hundred twenty-nine million, twelve thousand, eight hundred thirty".