442107891 has 12 divisors (see below), whose sum is σ = 641946240. Its totient is φ = 293194320.

The previous prime is 442107889. The next prime is 442107907. The reversal of 442107891 is 198701244.

It is not a de Polignac number, because 442107891 - 2¹ = 442107889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (442107091) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 126876 + ... + 130313.

It is an arithmetic number, because the mean of its divisors is an integer number (53495520).

Almost surely, 2^442107891 is an apocalyptic number.

442107891 is a deficient number, since it is larger than the sum of its proper divisors (199838349).

442107891 is a wasteful number, since it uses less digits than its factorization.

442107891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257386 (or 257383 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 442107891 is about 21026.3618108317. The cubic root of 442107891 is about 761.8031349167.

The spelling of 442107891 in words is "four hundred forty-two million, one hundred seven thousand, eight hundred ninety-one".