42347689 has 8 divisors (see below), whose sum is σ = 43328520. Its totient is φ = 41373696.

The previous prime is 42347681. The next prime is 42347717. The reversal of 42347689 is 98674324.

It can be written as a sum of positive squares in 4 ways, for example, as 16000000 + 26347689 = 4000^2 + 5133^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 42347689 - 2³ = 42347681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42347681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12067 + ... + 15175.

It is an arithmetic number, because the mean of its divisors is an integer number (5416065).

Almost surely, 2^42347689 is an apocalyptic number.

It is an amenable number.

42347689 is a deficient number, since it is larger than the sum of its proper divisors (980831).

42347689 is a wasteful number, since it uses less digits than its factorization.

42347689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3419.

The product of its digits is 290304, while the sum is 43.

The square root of 42347689 is about 6507.5101997615. The cubic root of 42347689 is about 348.5592172604.

The spelling of 42347689 in words is "forty-two million, three hundred forty-seven thousand, six hundred eighty-nine".