129455442 has 64 divisors (see below), whose sum is σ = 314496000. Its totient is φ = 39294720.

The previous prime is 129455441. The next prime is 129455461. The reversal of 129455442 is 244554921.

It is a happy number.

129455442 is a `hidden beast` number, since 12 + 94 + 554 + 4 + 2 = 666.

It is a super-2 number, since 2×129455442² = 33517422926830728, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 129455397 and 129455406.

It is not an unprimeable number, because it can be changed into a prime (129455441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26184 + ... + 30732.

It is an arithmetic number, because the mean of its divisors is an integer number (4914000).

Almost surely, 2^129455442 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129455442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (157248000).

129455442 is an abundant number, since it is smaller than the sum of its proper divisors (185040558).

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

129455442 is a wasteful number, since it uses less digits than its factorization.

129455442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4608 (or 4602 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The square root of 129455442 is about 11377.8487421832. The cubic root of 129455442 is about 505.8713734099.

The spelling of 129455442 in words is "one hundred twenty-nine million, four hundred fifty-five thousand, four hundred forty-two".