129746440 has 64 divisors (see below), whose sum is σ = 311328000. Its totient is φ = 48522240.

The previous prime is 129746429. The next prime is 129746467. The reversal of 129746440 is 44647921.

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 129746440.

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, 58960 + ... + 61120.

It is an arithmetic number, because the mean of its divisors is an integer number (4864500).

Almost surely, 2^129746440 is an apocalyptic number.

129746440 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 129746440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (155664000).

129746440 is an abundant number, since it is smaller than the sum of its proper divisors (181581560).

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

129746440 is a wasteful number, since it uses less digits than its factorization.

129746440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2270 (or 2266 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 129746440 is about 11390.6294821665. The cubic root of 129746440 is about 506.2501328049.

The spelling of 129746440 in words is "one hundred twenty-nine million, seven hundred forty-six thousand, four hundred forty".