42328261 has 4 divisors (see below), whose sum is σ = 42341292. Its totient is φ = 42315232.

The previous prime is 42328243. The next prime is 42328267. The reversal of 42328261 is 16282324.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 324900 + 42003361 = 570^2 + 6481^2 .

It is a cyclic number.

It is not a de Polignac number, because 42328261 - 2⁹ = 42327749 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 (42328267) 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, 2745 + ... + 9601.

It is an arithmetic number, because the mean of its divisors is an integer number (10585323).

Almost surely, 2^42328261 is an apocalyptic number.

It is an amenable number.

42328261 is a deficient number, since it is larger than the sum of its proper divisors (13031).

42328261 is an equidigital number, since it uses as much as digits as its factorization.

42328261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13030.

The product of its digits is 4608, while the sum is 28.

The square root of 42328261 is about 6506.0172917077. The cubic root of 42328261 is about 348.5059058561.

The spelling of 42328261 in words is "forty-two million, three hundred twenty-eight thousand, two hundred sixty-one".