42798221 has 4 divisors (see below), whose sum is σ = 43384572. Its totient is φ = 42211872.

The previous prime is 42798211. The next prime is 42798227. The reversal of 42798221 is 12289724.

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 20340100 + 22458121 = 4510^2 + 4739^2 .

It is a cyclic number.

It is not a de Polignac number, because 42798221 - 2⁶ = 42798157 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 (42798227) 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, 293066 + ... + 293211.

It is an arithmetic number, because the mean of its divisors is an integer number (10846143).

Almost surely, 2^42798221 is an apocalyptic number.

It is an amenable number.

42798221 is a deficient number, since it is larger than the sum of its proper divisors (586351).

42798221 is an equidigital number, since it uses as much as digits as its factorization.

42798221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 586350.

The product of its digits is 16128, while the sum is 35.

The square root of 42798221 is about 6542.0349280633. The cubic root of 42798221 is about 349.7909527165.

The spelling of 42798221 in words is "forty-two million, seven hundred ninety-eight thousand, two hundred twenty-one".