42009219 has 48 divisors (see below), whose sum is σ = 73297440. Its totient is φ = 23708160.

The previous prime is 42009203. The next prime is 42009221. The reversal of 42009219 is 91290024.

It is not a de Polignac number, because 42009219 - 2⁴ = 42009203 is a prime.

It is a super-2 number, since 2×42009219² = 3529548961979922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 42009192 and 42009201.

It is not an unprimeable number, because it can be changed into a prime (42004219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 149359 + ... + 149639.

It is an arithmetic number, because the mean of its divisors is an integer number (1527030).

Almost surely, 2^42009219 is an apocalyptic number.

42009219 is a gapful number since it is divisible by the number (49) formed by its first and last digit.

42009219 is a deficient number, since it is larger than the sum of its proper divisors (31288221).

42009219 is a wasteful number, since it uses less digits than its factorization.

42009219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417 (or 404 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 42009219 is about 6481.4519206733. The cubic root of 42009219 is about 347.6280955563.

The spelling of 42009219 in words is "forty-two million, nine thousand, two hundred nineteen".