42439942889 has 4 divisors (see below), whose sum is σ = 42491137860. Its totient is φ = 42388747920.

The previous prime is 42439942877. The next prime is 42439942901. The reversal of 42439942889 is 98824993424.

42439942889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is an interprime number because it is at equal distance from previous prime (42439942877) and next prime (42439942901).

It can be written as a sum of positive squares in 2 ways, for example, as 19960038400 + 22479904489 = 141280^2 + 149933^2 .

It is a cyclic number.

It is not a de Polignac number, because 42439942889 - 2⁴ = 42439942873 is a prime.

It is a super-2 number, since 2×42439942889² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42439942289) 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, 25596242 + ... + 25597899.

It is an arithmetic number, because the mean of its divisors is an integer number (10622784465).

Almost surely, 2^42439942889 is an apocalyptic number.

It is an amenable number.

42439942889 is a deficient number, since it is larger than the sum of its proper divisors (51194971).

42439942889 is an equidigital number, since it uses as much as digits as its factorization.

42439942889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51194970.

The product of its digits is 35831808, while the sum is 62.

The spelling of 42439942889 in words is "forty-two billion, four hundred thirty-nine million, nine hundred forty-two thousand, eight hundred eighty-nine".