42875009 has 4 divisors (see below), whose sum is σ = 43577940. Its totient is φ = 42172080.

The previous prime is 42874991. The next prime is 42875033. The reversal of 42875009 is 90057824.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24039409 + 18835600 = 4903^2 + 4340^2 .

It is a cyclic number.

It is not a de Polignac number, because 42875009 - 2⁸ = 42874753 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42875009.

It is not an unprimeable number, because it can be changed into a prime (42875069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 351374 + ... + 351495.

It is an arithmetic number, because the mean of its divisors is an integer number (10894485).

Almost surely, 2^42875009 is an apocalyptic number.

It is an amenable number.

42875009 is a deficient number, since it is larger than the sum of its proper divisors (702931).

42875009 is an equidigital number, since it uses as much as digits as its factorization.

42875009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702930.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 42875009 is about 6547.9011140976. The cubic root of 42875009 is about 350.0000244898. Note that the first 4 decimals are identical.

The spelling of 42875009 in words is "forty-two million, eight hundred seventy-five thousand, nine".