42706385 has 4 divisors (see below), whose sum is σ = 51247668. Its totient is φ = 34165104.

The previous prime is 42706381. The next prime is 42706421. The reversal of 42706385 is 58360724.

It is a happy number.

42706385 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 can be written as a sum of positive squares in 2 ways, for example, as 19963024 + 22743361 = 4468^2 + 4769^2 .

It is a cyclic number.

It is not a de Polignac number, because 42706385 - 2² = 42706381 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42706381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4270634 + ... + 4270643.

It is an arithmetic number, because the mean of its divisors is an integer number (12811917).

Almost surely, 2^42706385 is an apocalyptic number.

It is an amenable number.

42706385 is a deficient number, since it is larger than the sum of its proper divisors (8541283).

42706385 is an equidigital number, since it uses as much as digits as its factorization.

42706385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8541282.

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 42706385 is about 6535.0122417636. The cubic root of 42706385 is about 349.5405808919.

The spelling of 42706385 in words is "forty-two million, seven hundred six thousand, three hundred eighty-five".