42490809 has 6 divisors (see below), whose sum is σ = 61375626. Its totient is φ = 28327200.

The previous prime is 42490807. The next prime is 42490813. The reversal of 42490809 is 90809424.

It is a happy number.

42490809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 38378025 + 4112784 = 6195^2 + 2028^2 .

It is not a de Polignac number, because 42490809 - 2¹ = 42490807 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42490807) 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, 2360592 + ... + 2360609.

It is an arithmetic number, because the mean of its divisors is an integer number (10229271).

Almost surely, 2^42490809 is an apocalyptic number.

It is an amenable number.

42490809 is a deficient number, since it is larger than the sum of its proper divisors (18884817).

42490809 is a wasteful number, since it uses less digits than its factorization.

42490809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4721207 (or 4721204 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 42490809 is about 6518.4974495661. The cubic root of 42490809 is about 348.9514441086.

The spelling of 42490809 in words is "forty-two million, four hundred ninety thousand, eight hundred nine".