42812247 has 4 divisors (see below), whose sum is σ = 57083000. Its totient is φ = 28541496.

The previous prime is 42812243. The next prime is 42812249. The reversal of 42812247 is 74221824.

42812247 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 42812247 - 2² = 42812243 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42812243) 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 3 ways as a sum of consecutive naturals, for example, 7135372 + ... + 7135377.

It is an arithmetic number, because the mean of its divisors is an integer number (14270750).

Almost surely, 2^42812247 is an apocalyptic number.

42812247 is a deficient number, since it is larger than the sum of its proper divisors (14270753).

42812247 is a wasteful number, since it uses less digits than its factorization.

42812247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14270752.

The product of its digits is 7168, while the sum is 30.

The square root of 42812247 is about 6543.1068308564. The cubic root of 42812247 is about 349.8291601617.

The spelling of 42812247 in words is "forty-two million, eight hundred twelve thousand, two hundred forty-seven".