42006493 has 2 divisors, whose sum is σ = 42006494. Its totient is φ = 42006492.

The previous prime is 42006469. The next prime is 42006551. The reversal of 42006493 is 39460024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32752729 + 9253764 = 5723^2 + 3042^2 .

It is a cyclic number.

It is not a de Polignac number, because 42006493 - 2¹³ = 41998301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42006403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21003246 + 21003247.

It is an arithmetic number, because the mean of its divisors is an integer number (21003247).

Almost surely, 2^42006493 is an apocalyptic number.

It is an amenable number.

42006493 is a deficient number, since it is larger than the sum of its proper divisors (1).

42006493 is an equidigital number, since it uses as much as digits as its factorization.

42006493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 42006493 is about 6481.2416248740. The cubic root of 42006493 is about 347.6205761379.

The spelling of 42006493 in words is "forty-two million, six thousand, four hundred ninety-three".