42549673 has 2 divisors, whose sum is σ = 42549674. Its totient is φ = 42549672.

The previous prime is 42549671. The next prime is 42549733. The reversal of 42549673 is 37694524.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42549529 + 144 = 6523^2 + 12^2 .

It is a cyclic number.

It is not a de Polignac number, because 42549673 - 2¹ = 42549671 is a prime.

Together with 42549671, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (42549671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21274836 + 21274837.

It is an arithmetic number, because the mean of its divisors is an integer number (21274837).

Almost surely, 2^42549673 is an apocalyptic number.

It is an amenable number.

42549673 is a deficient number, since it is larger than the sum of its proper divisors (1).

42549673 is an equidigital number, since it uses as much as digits as its factorization.

42549673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 40.

The square root of 42549673 is about 6523.0110378567. The cubic root of 42549673 is about 349.1125079586.

The spelling of 42549673 in words is "forty-two million, five hundred forty-nine thousand, six hundred seventy-three".