42806019 has 4 divisors (see below), whose sum is σ = 57074696. Its totient is φ = 28537344.

The previous prime is 42805999. The next prime is 42806041. The reversal of 42806019 is 91060824.

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

It is not a de Polignac number, because 42806019 - 2⁷ = 42805891 is a prime.

It is a super-2 number, since 2×42806019² = 3664710525256722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42806219) 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, 7134334 + ... + 7134339.

It is an arithmetic number, because the mean of its divisors is an integer number (14268674).

Almost surely, 2^42806019 is an apocalyptic number.

42806019 is a deficient number, since it is larger than the sum of its proper divisors (14268677).

42806019 is a wasteful number, since it uses less digits than its factorization.

42806019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14268676.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 42806019 is about 6542.6308928443. The cubic root of 42806019 is about 349.8121958441.

The spelling of 42806019 in words is "forty-two million, eight hundred six thousand, nineteen".