42840529 has 4 divisors (see below), whose sum is σ = 43177984. Its totient is φ = 42503076.

The previous prime is 42840517. The next prime is 42840557. The reversal of 42840529 is 92504824.

42840529 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42840529 - 2¹³ = 42832337 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42840494 and 42840503.

It is not an unprimeable number, because it can be changed into a prime (42810529) 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, 168537 + ... + 168790.

It is an arithmetic number, because the mean of its divisors is an integer number (10794496).

Almost surely, 2^42840529 is an apocalyptic number.

It is an amenable number.

42840529 is a deficient number, since it is larger than the sum of its proper divisors (337455).

42840529 is a wasteful number, since it uses less digits than its factorization.

42840529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337454.

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 42840529 is about 6545.2676797821. The cubic root of 42840529 is about 349.9061762116.

The spelling of 42840529 in words is "forty-two million, eight hundred forty thousand, five hundred twenty-nine".