42473309 has 4 divisors (see below), whose sum is σ = 42526620. Its totient is φ = 42420000.

The previous prime is 42473287. The next prime is 42473311. The reversal of 42473309 is 90337424.

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 25786084 + 16687225 = 5078^2 + 4085^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42473309 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42473339) 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, 25442 + ... + 27059.

It is an arithmetic number, because the mean of its divisors is an integer number (10631655).

Almost surely, 2^42473309 is an apocalyptic number.

It is an amenable number.

42473309 is a deficient number, since it is larger than the sum of its proper divisors (53311).

42473309 is an equidigital number, since it uses as much as digits as its factorization.

42473309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53310.

The product of its (nonzero) digits is 18144, while the sum is 32.

The square root of 42473309 is about 6517.1549774422. The cubic root of 42473309 is about 348.9035318742.

The spelling of 42473309 in words is "forty-two million, four hundred seventy-three thousand, three hundred nine".