42839421669 has 20 divisors (see below), whose sum is σ = 69812392320. Its totient is φ = 25963285320.

The previous prime is 42839421649. The next prime is 42839421743. The reversal of 42839421669 is 96612493824.

42839421669 is a `hidden beast` number, since 4 + 283 + 94 + 216 + 69 = 666.

It is not a de Polignac number, because 42839421669 - 2¹² = 42839417573 is a prime.

It is a super-2 number, since 2×42839421669² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42839421649) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 24039189 + ... + 24040970.

It is an arithmetic number, because the mean of its divisors is an integer number (3490619616).

Almost surely, 2^42839421669 is an apocalyptic number.

It is an amenable number.

42839421669 is a deficient number, since it is larger than the sum of its proper divisors (26972970651).

42839421669 is a wasteful number, since it uses less digits than its factorization.

42839421669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48080182 (or 48080173 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 54.

The spelling of 42839421669 in words is "forty-two billion, eight hundred thirty-nine million, four hundred twenty-one thousand, six hundred sixty-nine".