129893820 has 48 divisors (see below), whose sum is σ = 415661568. Its totient is φ = 29689920.

The previous prime is 129893761. The next prime is 129893833. The reversal of 129893820 is 28398921.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 154216 + ... + 155055.

It is an arithmetic number, because the mean of its divisors is an integer number (8659616).

Almost surely, 2^129893820 is an apocalyptic number.

129893820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129893820 is an abundant number, since it is smaller than the sum of its proper divisors (285767748).

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

129893820 is a wasteful number, since it uses less digits than its factorization.

129893820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309290 (or 309288 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 129893820 is about 11397.0969987975. The cubic root of 129893820 is about 506.4417447724.

The spelling of 129893820 in words is "one hundred twenty-nine million, eight hundred ninety-three thousand, eight hundred twenty".