42775813 has 4 divisors (see below), whose sum is σ = 42953548. Its totient is φ = 42598080.

The previous prime is 42775801. The next prime is 42775829. The reversal of 42775813 is 31857724.

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 12723489 + 30052324 = 3567^2 + 5482^2 .

It is a cyclic number.

It is not a de Polignac number, because 42775813 - 2¹⁷ = 42644741 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 (42775613) 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 3 ways as a sum of consecutive naturals, for example, 88506 + ... + 88987.

It is an arithmetic number, because the mean of its divisors is an integer number (10738387).

Almost surely, 2^42775813 is an apocalyptic number.

It is an amenable number.

42775813 is a deficient number, since it is larger than the sum of its proper divisors (177735).

42775813 is a wasteful number, since it uses less digits than its factorization.

42775813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177734.

The product of its digits is 47040, while the sum is 37.

The square root of 42775813 is about 6540.3220868700. The cubic root of 42775813 is about 349.7298950072.

The spelling of 42775813 in words is "forty-two million, seven hundred seventy-five thousand, eight hundred thirteen".