129274240 has 64 divisors (see below), whose sum is σ = 313392960. Its totient is φ = 50982912.

The previous prime is 129274207. The next prime is 129274241. The reversal of 129274240 is 42472921.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129274241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45337 + ... + 48103.

It is an arithmetic number, because the mean of its divisors is an integer number (4896765).

Almost surely, 2^129274240 is an apocalyptic number.

129274240 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 129274240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (156696480).

129274240 is an abundant number, since it is smaller than the sum of its proper divisors (184118720).

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

129274240 is an equidigital number, since it uses as much as digits as its factorization.

129274240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2859 (or 2847 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 129274240 is about 11369.8830249040. The cubic root of 129274240 is about 505.6352362880.

The spelling of 129274240 in words is "one hundred twenty-nine million, two hundred seventy-four thousand, two hundred forty".