42758221 has 4 divisors (see below), whose sum is σ = 46645344. Its totient is φ = 38871100.

The previous prime is 42758201. The next prime is 42758237. The reversal of 42758221 is 12285724.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42758221 - 2¹⁵ = 42725453 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42758201) 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, 1943545 + ... + 1943566.

It is an arithmetic number, because the mean of its divisors is an integer number (11661336).

Almost surely, 2^42758221 is an apocalyptic number.

It is an amenable number.

42758221 is a deficient number, since it is larger than the sum of its proper divisors (3887123).

42758221 is a wasteful number, since it uses less digits than its factorization.

42758221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3887122.

The product of its digits is 8960, while the sum is 31.

The square root of 42758221 is about 6538.9770606724. The cubic root of 42758221 is about 349.6819450756.

The spelling of 42758221 in words is "forty-two million, seven hundred fifty-eight thousand, two hundred twenty-one".