42705689 has 8 divisors (see below), whose sum is σ = 46231752. Its totient is φ = 39214080.

The previous prime is 42705679. The next prime is 42705697. The reversal of 42705689 is 98650724.

It can be written as a sum of positive squares in 4 ways, for example, as 5593225 + 37112464 = 2365^2 + 6092^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42705689 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42705679) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6002 + ... + 11019.

It is an arithmetic number, because the mean of its divisors is an integer number (5778969).

Almost surely, 2^42705689 is an apocalyptic number.

It is an amenable number.

42705689 is a deficient number, since it is larger than the sum of its proper divisors (3526063).

42705689 is a wasteful number, since it uses less digits than its factorization.

42705689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17227.

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 42705689 is about 6534.9589899249. The cubic root of 42705689 is about 349.5386820223.

The spelling of 42705689 in words is "forty-two million, seven hundred five thousand, six hundred eighty-nine".