129900000 has 144 divisors (see below), whose sum is σ = 427191408. Its totient is φ = 34560000.

The previous prime is 129899999. The next prime is 129900031. The reversal of 129900000 is 9921.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 129900000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 299784 + ... + 300216.

It is an arithmetic number, because the mean of its divisors is an integer number (2966607).

Almost surely, 2^129900000 is an apocalyptic number.

129900000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129900000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (213595704).

129900000 is an abundant number, since it is smaller than the sum of its proper divisors (297291408).

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

129900000 is an frugal number, since it uses more digits than its factorization.

129900000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471 (or 443 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 21.

The square root of 129900000 is about 11397.3681172453. The cubic root of 129900000 is about 506.4497763589.

Adding to 129900000 its reverse (9921), we get a palindrome (129909921).

The spelling of 129900000 in words is "one hundred twenty-nine million, nine hundred thousand".