42509803 has 6 divisors (see below), whose sum is σ = 49450236. Its totient is φ = 36436932.

The previous prime is 42509767. The next prime is 42509807. The reversal of 42509803 is 30890524.

42509803 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42509803 - 2²⁵ = 8955371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42509807) 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 5 ways as a sum of consecutive naturals, for example, 433725 + ... + 433822.

It is an arithmetic number, because the mean of its divisors is an integer number (8241706).

Almost surely, 2^42509803 is an apocalyptic number.

42509803 is a deficient number, since it is larger than the sum of its proper divisors (6940433).

42509803 is an equidigital number, since it uses as much as digits as its factorization.

42509803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 867561 (or 867554 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 42509803 is about 6519.9542176307. The cubic root of 42509803 is about 349.0034317936.

The spelling of 42509803 in words is "forty-two million, five hundred nine thousand, eight hundred three".