30129988 has 48 divisors (see below), whose sum is σ = 62648320. Its totient is φ = 12410496.

The previous prime is 30129959. The next prime is 30129989. The reversal of 30129988 is 88992103.

It is a self number, because there is not a number n which added to its sum of digits gives 30129988.

It is not an unprimeable number, because it can be changed into a prime (30129989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 131458 + ... + 131686.

Almost surely, 2^30129988 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30129988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31324160).

30129988 is an abundant number, since it is smaller than the sum of its proper divisors (32518332).

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

30129988 is a wasteful number, since it uses less digits than its factorization.

30129988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404 (or 402 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 30129988 is about 5489.0789755659. The cubic root of 30129988 is about 311.1713850150.

The spelling of 30129988 in words is "thirty million, one hundred twenty-nine thousand, nine hundred eighty-eight".