42782219 has 4 divisors (see below), whose sum is σ = 42799344. Its totient is φ = 42765096.

The previous prime is 42782209. The next prime is 42782237. The reversal of 42782219 is 91228724.

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

It is a cyclic number.

It is not a de Polignac number, because 42782219 - 2¹⁶ = 42716683 is a prime.

It is a super-2 number, since 2×42782219² = 3660636525127922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42782209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4007 + ... + 10080.

It is an arithmetic number, because the mean of its divisors is an integer number (10699836).

Almost surely, 2^42782219 is an apocalyptic number.

42782219 is a deficient number, since it is larger than the sum of its proper divisors (17125).

42782219 is a wasteful number, since it uses less digits than its factorization.

42782219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17124.

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

The square root of 42782219 is about 6540.8117997692. The cubic root of 42782219 is about 349.7473523640.

The spelling of 42782219 in words is "forty-two million, seven hundred eighty-two thousand, two hundred nineteen".