42625809 has 12 divisors (see below), whose sum is σ = 61749636. Its totient is φ = 28334592.

The previous prime is 42625799. The next prime is 42625811. The reversal of 42625809 is 90852624.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 16646400 + 25979409 = 4080^2 + 5097^2 .

It is a de Polignac number, because none of the positive numbers 2^k-42625809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42625309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3532 + ... + 9885.

It is an arithmetic number, because the mean of its divisors is an integer number (5145803).

Almost surely, 2^42625809 is an apocalyptic number.

It is an amenable number.

42625809 is a deficient number, since it is larger than the sum of its proper divisors (19123827).

42625809 is a wasteful number, since it uses less digits than its factorization.

42625809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13776 (or 13773 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 42625809 is about 6528.8443847284. The cubic root of 42625809 is about 349.3206113365.

It can be divided in two parts, 42625 and 809, that added together give a palindrome (43434).

The spelling of 42625809 in words is "forty-two million, six hundred twenty-five thousand, eight hundred nine".