129242250 has 128 divisors (see below), whose sum is σ = 367960320. Its totient is φ = 33552000.

The previous prime is 129242233. The next prime is 129242261. The reversal of 129242250 is 52242921.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 276517 + ... + 276983.

It is an arithmetic number, because the mean of its divisors is an integer number (2874690).

Almost surely, 2^129242250 is an apocalyptic number.

129242250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 129242250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (183980160).

129242250 is an abundant number, since it is smaller than the sum of its proper divisors (238718070).

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

129242250 is a wasteful number, since it uses less digits than its factorization.

129242250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534 (or 518 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 129242250 is about 11368.4761511823. The cubic root of 129242250 is about 505.5935249473.

The spelling of 129242250 in words is "one hundred twenty-nine million, two hundred forty-two thousand, two hundred fifty".