42398739617 has 4 divisors (see below), whose sum is σ = 45660181140. Its totient is φ = 39137298096.

The previous prime is 42398739613. The next prime is 42398739623. The reversal of 42398739617 is 71693789324.

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

It can be written as a sum of positive squares in 2 ways, for example, as 28780783201 + 13617956416 = 169649^2 + 116696^2 .

It is not a de Polignac number, because 42398739617 - 2² = 42398739613 is a prime.

It is a super-2 number, since 2×42398739617² (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 (42398739613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1630720742 + ... + 1630720767.

It is an arithmetic number, because the mean of its divisors is an integer number (11415045285).

Almost surely, 2^42398739617 is an apocalyptic number.

It is an amenable number.

42398739617 is a deficient number, since it is larger than the sum of its proper divisors (3261441523).

42398739617 is a wasteful number, since it uses less digits than its factorization.

42398739617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3261441522.

The product of its digits is 13716864, while the sum is 59.

The spelling of 42398739617 in words is "forty-two billion, three hundred ninety-eight million, seven hundred thirty-nine thousand, six hundred seventeen".