442129871 has 4 divisors (see below), whose sum is σ = 442368552. Its totient is φ = 441891192.

The previous prime is 442129861. The next prime is 442129873. The reversal of 442129871 is 178921244.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 442129871 - 2²⁶ = 375021007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442129873) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116540 + ... + 120273.

It is an arithmetic number, because the mean of its divisors is an integer number (110592138).

Almost surely, 2^442129871 is an apocalyptic number.

442129871 is a deficient number, since it is larger than the sum of its proper divisors (238681).

442129871 is a wasteful number, since it uses less digits than its factorization.

442129871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238680.

The product of its digits is 32256, while the sum is 38.

The square root of 442129871 is about 21026.8844815393. The cubic root of 442129871 is about 761.8157594033.

The spelling of 442129871 in words is "four hundred forty-two million, one hundred twenty-nine thousand, eight hundred seventy-one".