42905543 has 2 divisors, whose sum is σ = 42905544. Its totient is φ = 42905542.

The previous prime is 42905539. The next prime is 42905549. The reversal of 42905543 is 34550924.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42905543 - 2² = 42905539 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42905549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21452771 + 21452772.

It is an arithmetic number, because the mean of its divisors is an integer number (21452772).

Almost surely, 2^42905543 is an apocalyptic number.

42905543 is a deficient number, since it is larger than the sum of its proper divisors (1).

42905543 is an equidigital number, since it uses as much as digits as its factorization.

42905543 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 42905543 is about 6550.2322859575. The cubic root of 42905543 is about 350.0830904767.

The spelling of 42905543 in words is "forty-two million, nine hundred five thousand, five hundred forty-three".