42985647 has 20 divisors (see below), whose sum is σ = 64886976. Its totient is φ = 28356480.

The previous prime is 42985637. The next prime is 42985651. The reversal of 42985647 is 74658924.

It is a happy number.

It is not a de Polignac number, because 42985647 - 2⁷ = 42985519 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42985637) 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, 5122 + ... + 10592.

Almost surely, 2^42985647 is an apocalyptic number.

42985647 is a deficient number, since it is larger than the sum of its proper divisors (21901329).

42985647 is an equidigital number, since it uses as much as digits as its factorization.

42985647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5580 (or 5571 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The square root of 42985647 is about 6556.3440269711. The cubic root of 42985647 is about 350.3008216447.

The spelling of 42985647 in words is "forty-two million, nine hundred eighty-five thousand, six hundred forty-seven".