42219109 has 8 divisors (see below), whose sum is σ = 45911448. Its totient is φ = 38661120.

The previous prime is 42219091. The next prime is 42219131. The reversal of 42219109 is 90191224.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 20223009 + 21996100 = 4497^2 + 4690^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42219109 - 2⁹ = 42218597 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 (42219139) 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 7 ways as a sum of consecutive naturals, for example, 32932 + ... + 34189.

It is an arithmetic number, because the mean of its divisors is an integer number (5738931).

Almost surely, 2^42219109 is an apocalyptic number.

It is an amenable number.

42219109 is a deficient number, since it is larger than the sum of its proper divisors (3692339).

42219109 is a wasteful number, since it uses less digits than its factorization.

42219109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67175.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 42219109 is about 6497.6233347279. The cubic root of 42219109 is about 348.2060836198.

The spelling of 42219109 in words is "forty-two million, two hundred nineteen thousand, one hundred nine".