42420009 has 8 divisors (see below), whose sum is σ = 56637760. Its totient is φ = 28241136.

The previous prime is 42419999. The next prime is 42420013. The reversal of 42420009 is 90002424.

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

It is not a de Polignac number, because 42420009 - 2¹¹ = 42417961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42420109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7069 + ... + 11610.

It is an arithmetic number, because the mean of its divisors is an integer number (7079720).

Almost surely, 2^42420009 is an apocalyptic number.

It is an amenable number.

42420009 is a deficient number, since it is larger than the sum of its proper divisors (14217751).

42420009 is a wasteful number, since it uses less digits than its factorization.

42420009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19439.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 42420009 is about 6513.0644860925. The cubic root of 42420009 is about 348.7575237647.

The spelling of 42420009 in words is "forty-two million, four hundred twenty thousand, nine".